最新色国产精品精品视频,中文字幕日韩一区二区不卡,亚洲有码转帖,夜夜躁日日躁狠狠久久av,中国凸偷窥xxxx自由视频

Abstract:In recent years, growth of GaN-based materials-related quantum dots has become a hot topic in semiconductor materials research. Considerable efforts have been devoted to growth of self-assembled quantum dots of GaN-based materials via MOCVD (Metal Organic Chemical Vapor Deposition) and there are a lot of relevant literatures. There is, however, few review papers for the topic. In this paper, different experimental methods for fabrication of quantum dots of GaN-based materials via MOCVD are critically reviewed and the experimental conditions and parameters, which may affect growth of the quantum dots, are analyzed, with an aim at providing some critical reference for the related future experiment research.

Abstract:采用PLD法在LaAlO3（012）單晶襯底上外延生長了高、雙摻雜La1/3（Ca2，3Sr1/3）2，3MnO3（LCSMO）薄膜。薄膜的x射線衍射譜表明，薄膜具有銚鈦礦贗立方結(jié)構(gòu)，且具有（012）方向的擇優(yōu)取向：用原子力顯微鏡對(duì)薄膜的表面形貌進(jìn)行了分析，發(fā)現(xiàn)薄膜表面相對(duì)比較平坦；在密封的液氮杜瓦瓶里用四探針法對(duì)薄膜的輸運(yùn)特性進(jìn)行了測(cè)試，電阻一溫度試驗(yàn)曲線表明，在溫度77K～400K的范圍內(nèi)薄膜呈現(xiàn)類半導(dǎo)體特性，沒有金屬一絕緣體轉(zhuǎn)變溫度（TM1）出現(xiàn)；薄膜的紅外透射譜在606cm。處宵一個(gè)很強(qiáng)的吸收峰，由紅外透射譜計(jì)算出光學(xué)能隙氏。。大約為0．7eV，薄膜的光學(xué)折射率為1．373。分析認(rèn)為LCSMO薄膜的類半導(dǎo)體特性是由于A離子半徑變化引起晶格畸變?cè)斐傻摹?/p>

Abstract:研究了用簡單混雜和球磨方法制備的天然石墨／銻復(fù)合材料作為鋰離子電池負(fù)極材料的嵌／放鋰性能以及循環(huán)過程中嵌／放鋰容量衰減機(jī)理。復(fù)合材料中的銻以獨(dú)立的可逆嵌／放鋰反應(yīng)參與吸／放鋰過程并顯著提高復(fù)合材料的嵌／放鋰容量。較大顆粒的銻在嵌／放鋰過程中體積劇變導(dǎo)致顆粒破碎、電接觸惡化而漸漸失去嵌／放鋰活性，因此由簡單混雜所獲得石墨／銻復(fù)合材料在循環(huán)過程中容量逐漸降低；采用球磨方法在天然石墨顆粒表面形成彌散分布的小顆粒銻則能獲得具有較高可逆容量和較好的循環(huán)穩(wěn)定性的石墨／銻復(fù)合鋰離子電池負(fù)極材料。

Abstract:以LiOH·H2O,Ni2O3,Co2O3和Al(OH)3為原料,采用固相反應(yīng)法合成Co-Al共摻入LiNiO2的化合物L(fēng)iNi0.85Co0.10Al0.05O2,由TG-DTA,XRD,SEM,DSC和電化學(xué)測(cè)試表征材料.結(jié)果表明,該材料首次放電容量達(dá)186.2mAh/g(3.0 V～4.3 V,18 mA/g),10次循環(huán)之后,容量還有180.1 mAh/g,容量保持率為96.7%;與未摻雜的LiNiO2相比,該材料顯示出良好的循環(huán)性能,且熱穩(wěn)定性也有所提高,是一種很有應(yīng)用前景的鋰離子電池正極材料.

Abstract:For decreasing the cost of AB_5-type hydrogen storage alloys, a low-cobalt Ml_(0.9)Mg_(0.1)Ni_(3.4)Co_(0.3)Al(0.3) alloy was investigated by examining the alloy structure, phase composition and some properties. Its properties were compared with those of a commercial alloy MmNi_(3.55)Co_(0.75)Mn_(0.4)Al_(0.3). The experiments' outcome shows that the low-cobalt alloy is composed of Mg-free LaNi_5 phase as matrix and Mg-contained LaNi3 phase as secondary phase. The hydrogen storage capacity (1.36wt% and 1.37wt% respectively), the greatest discharge capacity (320 mAh/g and 324 mAh/g respectively) and cycling stability (the residual capacity of two alloys is all 88% ) of Ml_(0.9)Mg_(3.4)Ni_(3.4)Co(0.3)Al_(0.3) are as good as those of MmNi_(3.55)Co(0.75)Mn(0.4)Al_(0.3). However, after the discharge current density exceeds 300 mA/g, the high-rate discharge abilities (HRD) of Ml_(0.9)Mg_(0.1)Ni_(3.4)Co_(0.3)Al_(0.3) are apparently better than those of MmNi_(3.55)Co_(0.75)Mn_(0.4)Al_(0.3).It is because there exists Mg-contained LaNi_3 phase as secondary phase which improves the electrochemical catalytic activity of alloy particles surface and the structure toughness of alloy particles.

Abstract:Fe89Zr7B4薄帶在550℃～720℃的溫度范圍內(nèi)分別退火20min，析出晶粒為13nm～17nm的α-Fe。720℃退火時(shí)有微量的第二相析出。Fe89Zr7B4納米晶薄帶的巨磁阻抗效應(yīng)與退火溫度緊密相關(guān)，存在一個(gè)最佳退火溫度，約為650℃。進(jìn)一步的實(shí)驗(yàn)結(jié)果顯示：Fe89Zr7B4納米晶薄帶在直流磁場(chǎng)引導(dǎo)下橫向磁導(dǎo)率的變化率在650℃存在最大值。經(jīng)典電磁理論與磁譜結(jié)合的模型能較好地描述Fe89Zr7B4納米晶薄帶磁阻抗與頻率的依賴關(guān)系。實(shí)驗(yàn)數(shù)據(jù)和理論計(jì)算結(jié)果均表明，巨磁阻抗效應(yīng)與磁場(chǎng)引導(dǎo)的橫向磁導(dǎo)率的變化緊密相關(guān)。

Abstract:Two different sputtering modes, co-sputtering and multilayer-sputtering, were used to fabricate FePt:Ag granular thin films. It is observed by the MFM and TEM images that smaller magnetic domain patterns and grains are more uniformly distributed in the co-sputtered granular films compared to in multilayer-sputtered ones. This difference in the microstructure is explained to be attributed to the more randomly distributed Ag atoms in the co-sputtered films. Further study on in-depth defects in these films confirms this explanation.

Abstract:采用磁控濺射方法在1Cr18Ni9Ti不銹鋼基體上沉積Ti-Si-N納米薄膜。結(jié)果發(fā)現(xiàn)：隨著Si含量增加，薄膜的晶粒尺寸逐漸變小，晶粒尺寸范圍在3nm～20nm之間。薄膜的顯微硬度相對(duì)于TiN有明顯增加，最大硬度可達(dá)43．5GPa。Si元素的加入亦改善了膜基結(jié)合強(qiáng)度。同時(shí)發(fā)現(xiàn)，Ti-Si-N納米薄膜的摩擦系數(shù)和比磨損率隨著Si含量的增加先減小后增加，其高溫摩擦系數(shù)明顯低干常溫，但比磨損率卻有顯著提高。

Abstract:采用GNP（Glycine-Nitrate Process）法合成La0.8Ca0.2CrO3初級(jí)粉料，研究甘氨酸用量對(duì)產(chǎn)物的晶體結(jié)構(gòu)和顯微形貌的影響，并測(cè)試燒結(jié)體的相對(duì)密度和電導(dǎo)率。研究結(jié)果表明，甘氨酸與金屬離子的摩爾比（G／M^n＋）控制在2．0～2．5時(shí)可得到顆粒尺寸細(xì)小、均勻（100nm～200nm）的單相鈣鈦礦粉體，燒結(jié)溫度為1350℃時(shí)樣品的相對(duì)密度達(dá)到91．0％，測(cè)試溫度為800℃時(shí)樣品的電導(dǎo)率達(dá)到30．5S.cm^-1。與常規(guī)固相法相比，GNP法制備的樣品具有更好的燒結(jié)活性和導(dǎo)電性能。

Abstract:采用熱氧化方法在TiNi合金表面制備了TiO2薄膜，并考察了TiO2／TiNi電極在KOH溶液中的光電化學(xué)性能。結(jié)果表明，TiNi貯氫合金表面形成的TiO2薄膜為金紅石型，結(jié)晶度隨氧化溫度升高逐漸增大；TiO2薄膜結(jié)構(gòu)、光電流和界面阻抗之間存在良好的相關(guān)性，700℃制備的TiO2薄膜光響應(yīng)電流最大，電極阻抗譜與鎳氫電池體系合金負(fù)極阻抗特征相似，高頻區(qū)半圓對(duì)應(yīng)于吸附氫的形成，而低頻區(qū)Warburg線性關(guān)系則反映了氫在電極中的固態(tài)擴(kuò)散過程；在光照射下具有特殊的光充電貯氫性能，放電容量從暗態(tài)時(shí)的5mAh／g提高至光照時(shí)的15mAh／g，對(duì)光充電反應(yīng)機(jī)理作了初步分析。

Abstract:采用機(jī)械力化學(xué)法制備廠納米Y2O3：Eu^3＋粉體。利用TG-DSC，XRD，TEM等實(shí)驗(yàn)技術(shù)對(duì)其進(jìn)行了表征，并對(duì)其光譜特性進(jìn)行r研究。結(jié)果表明：所得納米Y2O3：Eu^3＋為球形，粒度分布均勻，粒徑為約30nm～50nm，與體材料相比，該納米品的發(fā)射光普發(fā)生藍(lán)移，激發(fā)光譜發(fā)生紅移。

Abstract:Oxide ceramic layer was obtained on Ti-6Al-4V alloy in NaAlO_2, Na_3PO_4 mixed solution by micro-arc oxidation (MAO) technique. The structure and composition of MAO coatings were analyzed by scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). The results show: the surface and interface have the porous structure, but the difference between the diameter of pores in surface is quite large, the difference in interface is quite small, and there are some long hill paralleled to each other in interface. There is no obvious boundary between the loose layer and dense layer. The interface between the substrate and MAO coatings has a z-zig structure. The surface and interface are composed of Ti, Al, V, P elements, and Al element is inclined to enrich in surface, but P element enriched in interface according to EDS results. TiO_2, Al_2O_3, TiAl_2O_5 phases are identified in surface and interface, and the P element exists in PO_4~(3-) radical according to XPS analysis. V_2O_5 phase can be found in the interface and V element does not exist in the surface according to XPS analysis.

Abstract:利用等離子體法制備金屬納米鎳粉。發(fā)現(xiàn)收集系統(tǒng)效率偏低，且平均粒度越小的粉末收得率越低。分析表明，對(duì)于納米粒子不等溫流場(chǎng)中的氣固兩相流輸運(yùn)過程，粒子沉降由重力沉降過渡到熱泳沉降；粒子平均粒度從10μm下降到50nm時(shí)，熱泳力與重力、馬格紐斯升力的比值分別從0．07和0．02上升到2820和945，即熱泳力因素占主導(dǎo)地位：溫度梯度越大，粒子平均粒度越小。則熱泳影響越顯著，這是影響收得率的決定性因素。

Abstract:研究了活性填料納米Ni粉對(duì)陶瓷先驅(qū)體聚硅氮烷連接反應(yīng)燒結(jié)SiC陶瓷接頭性能的影響，同時(shí)與惰性填料納米SiC粉及活性填料微米Ni粉進(jìn)行了對(duì)比，指出填料的種類及顆粒度對(duì)連接強(qiáng)度均有較大影響?；钚蕴盍霞{米Ni粉的加入可減少連接層內(nèi)的孔隙和裂紋，同時(shí)還可以與聚硅氮烷的裂解產(chǎn)物及母材發(fā)生反應(yīng)，促進(jìn)聚硅氮烷的裂解，從而降低連接溫度，提高連接強(qiáng)度。當(dāng)連接溫度為1200℃時(shí)，其最大抗彎強(qiáng)度達(dá)到251．6MPa。微觀研究表明，連接層結(jié)構(gòu)較為均勻致密，且與母材間界面結(jié)合良好。惰性填料納米SiC粉對(duì)連接強(qiáng)度沒有明顯改善。微米Ni粉因不能與先驅(qū)體形成均勻的連接層而導(dǎo)致連接強(qiáng)度降低。

Abstract:采用熔體快淬法制備了LaFe11．5Si1．5化合物。利用X射線衍射和能譜分析測(cè)定了熔體快淬帶的相組成和元素分布：利用磁性能測(cè)試結(jié)果計(jì)算了磁熵變。結(jié)果表明：熔體快淬可以得到元素分布均勻的LaFe11．5Si1．5薄帶，其相組成為NaZn13型LaFe11．5Si1．5化合物和大量α-Fe。退火后，快淬帶中的α-Fe含量大大降低，得到了近似單相的LaFe11．5Si1．5化合物。由磁性能測(cè)試并經(jīng)計(jì)算發(fā)現(xiàn)，快淬帶經(jīng)1000℃，6h時(shí)效后具有巨大的磁熵變。由此可見，熔體快淬可成為一種制備更廉價(jià)的高性能磁致制冷材料的新方法。

Abstract:采用通常的固相反應(yīng)工藝制備了Gd2（WO4）3陶瓷，在低場(chǎng)（脈150V／mm）下測(cè)試了樣品的電學(xué)行為和介電常數(shù)隨溫度的變化。結(jié)果表明：隨溫度的升高，樣品首先呈現(xiàn)出線性的Ohm特征，在250℃以后開始呈現(xiàn)出半導(dǎo)體特征下的非線性電學(xué)行為，并且這種非線性隨溫度的升高而增大；樣品的介電常數(shù)和損耗因子在320℃350℃有明顯的變化。XRD分析表明：樣品中存在Gd2（WO4）3主晶相和W20O58次晶相。用WO3的相變可以簡單解釋上述實(shí)驗(yàn)結(jié)果。

Abstract:分別采用稀土改性劑（RES）和環(huán)氧氯丙烷（ECP）接枝改性方法對(duì)F-12芳綸纖維表面進(jìn)行改性處理，探討了RES濃度對(duì)于芳綸／環(huán)氧復(fù)合材料層問剪切強(qiáng)度（ILSS）的影響，初步分析了RES對(duì)于F-12芳綸纖維表面作用的機(jī)理，應(yīng)用SEM對(duì)復(fù)合材料層問剪切斷口進(jìn)行分析，并考察了稀土改性劑處理對(duì)于纖維強(qiáng)度的影響。實(shí)驗(yàn)結(jié)果表明：采用RES進(jìn)行表面改性處理，稀土元素通過配位化學(xué)反應(yīng)，能夠提高芳綸纖維表面活性基團(tuán)的濃度，從而提高芳綸纖維和環(huán)氧樹脂基體的界面結(jié)合力；當(dāng)稀十元素含量（ω,％）為0．5時(shí)，復(fù)合材料的層問剪切強(qiáng)度最好；稀土改性劑處理對(duì)于纖維本身的強(qiáng)度幾乎沒有影響。

Abstract:The Gibbs free energy changes of the reactions of magnesium and its alloy with some materials were calculated at high temperature. The possibilities of the reactions were analyzed by free energy criterion .The results show that SiC and ZrB2 have good stability to liquid magnesium and its alloy and they are the good materials of crucible used for magnesium and its alloy melting. The stability of SiC in the liquid magnesium and its alloy was tested by experiment.

Abstract:The rare earth lanthanum oxide doped molybdenum alloys containing different volume fraction lanthanum oxide particles were prepared by powder metallurgical processing. The microstructure and mechanical properties of the alloys were examined. It is found that the alloy has the fine lanthanum oxide particles and fine grain as well as high yield strength. The strengthening mechanism of the alloy is analyzed and explained in three aspects: matrix strengthening, fine grain size strengthening yielding Hall-Petch relationship, and fine particles strengthening according to the Orowan model. The quantitative relationships between the yield strengths of the alloys and the sizes, volume fraction of lanthanum oxide particles and the grain sizes were also presented.

Abstract:以不同的凝固速率制備了Cu-10Ag亞共晶合金。鑄態(tài)結(jié)構(gòu)由初生Ag沉淀,(Cu+Ag)共晶和Cu相組成。采用大變形制備了Cu-10Ag合金原位纖維復(fù)合材料。其中由初生Ag沉淀相所形成的Ag纖維具有較大直徑(d)并可用冪指數(shù)關(guān)系d=C·exp(-0.228η)擬合,式中η是真實(shí)應(yīng)變,C是與合金原始晶體尺寸有關(guān)的系數(shù),而由(Cu+Ag)共晶中的Ag層所形成的Ag纖維具有更細(xì)直徑(幾納米)。低溫中間熱處理可進(jìn)一步細(xì)化Ag纖維尺寸和改進(jìn)性能。經(jīng)熱機(jī)械處理的Cu-10Ag合金原位納米纖維復(fù)合材料具有高強(qiáng)度(σb＞1.5 GPa)和高電導(dǎo)率(＞60％IACS)。大變形Cu-10Ag合金原位納米纖維復(fù)合材料顯示了兩階段強(qiáng)化效應(yīng)。討論了影響Ag纖維尺寸的因素和復(fù)合材料的強(qiáng)化與形變機(jī)制。

Abstract:研究了新型高強(qiáng)高韌高損傷容限TC21鈦合金的超塑性拉伸變形行為及組織演化規(guī)律。結(jié)果表明,TC21合金具有良好的超塑性和較寬的超塑性溫度-應(yīng)變速率范圍(720℃～960℃,5.5×10~(-5)／s～1.1×10~(-2)／s)。在最佳超塑性條件下(900℃,3.3×10~(-4)／s),平均延伸率達(dá)到980％,最高延伸率達(dá)到1309％,平均流動(dòng)應(yīng)力僅為19.5 MPa。在超塑性拉伸過程中,試樣變形區(qū)將發(fā)生明顯的動(dòng)態(tài)再結(jié)晶,使原始條狀初生α相破斷、細(xì)化和等軸化,促進(jìn)超塑性的提高。隨著變形溫度提高、變形量增大和變形時(shí)間加長,將發(fā)生聚集再結(jié)晶,使再結(jié)晶α相合并長大成不規(guī)則的大片狀,引起顯微組織明顯粗化,斷口表面起伏增加。在最佳超塑性條件下,斷口中形成了大而深的空洞,晶界滑動(dòng)和晶間斷裂特征明顯。

Abstract:研究了SPZ鈦合金的超塑性變形及其變形前后的顯微組織。研究結(jié)果表明,大塑性變形后,SPZ合金軋棒組織為利于超塑性的細(xì)小均勻的等軸組織。SPZ合金在740℃～800℃之間具有超塑性,在760℃,初始應(yīng)變速率為1.11×10~(-3)s~(-1)時(shí),合金的最大超塑延伸率可達(dá)2149％；應(yīng)變速率為1.11×10.~(-2)s~(-1)時(shí),超塑延伸率仍可達(dá)1380％。超塑性變形后的晶粒尺寸比變形前粗大,變形溫度越高,晶粒長大程度越大。變形前合金的晶粒尺寸為0.89μm；應(yīng)變速率為2.22×10~(-3)s~(-1)時(shí),在740℃,760℃,780℃變形后晶粒尺寸分別為1.51μm,2.33μm,3.21μm。SPZ合金超塑性變形的微觀機(jī)制足以晶界滑動(dòng)為主,晶內(nèi)變形以及位錯(cuò)蠕變起協(xié)調(diào)作用。合金超塑性變形與類流態(tài)的關(guān)系還有待深入研究。

Abstract:研究了用改進(jìn)Lely法制備SiC單晶的過程中坩堝石墨化度對(duì)物質(zhì)傳輸和晶體生長速度的影響。在不同溫度下進(jìn)行石墨化處理得到了實(shí)驗(yàn)所用的坩堝。用XRD方法定量測(cè)定了晶體生長前坩堝的石墨化度，并用SEM分析了晶體生長后坩堝內(nèi)壁的反應(yīng)情況。實(shí)驗(yàn)結(jié)果表明，石墨坩堝在SiC晶體生長過程中是一個(gè)非常重要的碳源提供者：當(dāng)坩堝的石墨化程度較低時(shí)，晶體的生長速度快，生長速度由生長溫度所控制；隨著坩堝石墨化程度的提高，晶體生長速度減慢并由坩堝石墨化度所控制；當(dāng)石墨化度進(jìn)一步提高的時(shí)候，籽晶被碳化，晶體不能正常生長。

Abstract:報(bào)道了φ31mm×500mm大尺寸定向生長鉬-鈮合金單晶的研制情況,介紹了原料選用與制備時(shí)所必需遵循的原則,論述了坯料直徑與生長單晶直徑的關(guān)系,并分析了所研制的定向生長單晶的晶向偏角、力學(xué)性能和組織結(jié)構(gòu)。

Abstract:The change of morphology of Cr phase, mechanical properties and electrical conductivity of CuCr alloy under different cold deformation quantity and heat treatment were studied. The results show that when reduction is up to 70%, Cr particles are deformed heavily, and some of Cr particles are broken. After the following high temperature heat treatment, broken Cr particles in the microstructure dissolves, and tend to turn into spherical morphology. As a results the mechanical properties and electrical conductivity of CuCr alloy are improved by means of proper deformation and heat treatment, and its mechanism was analyzed from microstructure.

Abstract:首次采用浸漬法制備了硅鎢鉬酸摻雜聚苯胺催化劑H4SiW6Mo6O40／PAn。以環(huán)己酮和1，2．丙二醇為原料合成環(huán)己酮1，2-丙二醇縮酮。探討了硅鎢鉬酸摻雜聚苯胺催化劑對(duì)縮酮反應(yīng)的催化活性，較系統(tǒng)地研究了原料量比，催化劑用量，反應(yīng)時(shí)間諸因素對(duì)產(chǎn)品收率的影響。實(shí)驗(yàn)表明：硅鎢鉬酸摻雜聚苯胺是合成環(huán)己酮1,2-丙二醇縮酮的良好催化劑，在n（環(huán)己酮）：n（1，2-丙二醇）=1：1．7，催化劑用量為反應(yīng)物料總質(zhì)量的1．0％，環(huán)己烷為帶水劑，反應(yīng)時(shí)間1．0h的優(yōu)化條件下，環(huán)己酮1．2-丙二醇縮酮的收率可達(dá)84．6％。

Abstract:采用高溫固溶法制備Sc2O3（Dy2O3）和Yb2O3復(fù)合摻雜YSZ電解質(zhì)材料，研究了復(fù)合摻雜對(duì)YSZ燒結(jié)性和電性能的影響。結(jié)果表明：隨著Sc2O3含量的增加，試樣燒結(jié)密度降低（1600℃燒結(jié)密度由5．82g／cm^3降至5．24g／cm^3），而Dy2O3卻能提高燒結(jié)密度（1600℃燒結(jié)密度由5．63g／cm^3增至5．86g／cm^3）：當(dāng)摻雜總量x，％）為8～8．6時(shí)，材料電導(dǎo)率得到大幅度提高（1000℃時(shí)，0．18S／cm）；1nσ-1000／T呈現(xiàn)較好的線性關(guān)系，說明電導(dǎo)率σ與溫度T之間關(guān)系符合Arrhenius公式；XRD分析表明復(fù)合摻雜YSZ電解質(zhì)材料晶格常數(shù)有所增大，對(duì)提高電導(dǎo)率起積極作用；復(fù)合添加劑促進(jìn)了晶粒生長，尤其是含Dy試樣晶粒尺寸較大。

Abstract:介紹了化學(xué)氣相沉積法(CVD)制備難熔金屬鉬膜層的原理和方法。以MoF_6和H_2為原料,采用化學(xué)氣相沉積法在純銅基體上沉積出難熔金屬鉬膜層。分析研究了沉積層的組織、結(jié)構(gòu)和硬度。實(shí)驗(yàn)結(jié)果表明：沉積膜層顯微組織隨沉積溫度變化而不同,沉積溫度較低時(shí),沉積層顯微組織為細(xì)晶層狀結(jié)構(gòu),沉積層硬度可達(dá)677×9.8 MPa：沉積溫度較高時(shí),沉積層顯微組織為致密的柱狀晶,硬度稍高于一般燒結(jié)鉬的硬度。

Abstract:利用預(yù)涂Si粉,Ti+Si粉的方法對(duì)TiAl合金進(jìn)行電子束表面合金化,“原位”制得了以高硬度金屬間化合物Ti_Si_3為增強(qiáng)相的表面改性層。利用光學(xué)顯微鏡、掃描電子顯微鏡、能譜儀及X射線衍射儀分析和研究了電子束表面改性層的顯微組織結(jié)構(gòu)；同時(shí)測(cè)試了沿改性層深度方向的硬度分布。結(jié)果表明,表面改性層由TiAl,Ti_3Al,Ti_Si_3相組成,Ti_5Si_3相的形態(tài)及分布沿層深呈均勻分布；改性層具有較高的顯微硬度(HV),最高達(dá)895×9.8 MPa,約是基體的3倍。

Abstract:對(duì)機(jī)械合金化SiC／MoSi2的先驅(qū)粉體及隨后反應(yīng)燒結(jié)制備SiC／MoSi2復(fù)合材料工藝研究表明：經(jīng)機(jī)械合金化的先驅(qū)粉體主要成分為MoSi2。反應(yīng)燒結(jié)溫度在Si的熔點(diǎn)以上時(shí)，由于Si在MoSi2顆粒的表面的潤濕鋪展，導(dǎo)致燒結(jié)1h后的產(chǎn)物為Mo5Si3C，MoSi2，SiC和單質(zhì)Si；在Si的熔點(diǎn)以下時(shí)，對(duì)過渡相Mo5Si3C的產(chǎn)生有一定抑制作用，反應(yīng)燒結(jié)過程中只有少量過渡相Mo5Si3C出現(xiàn)；通過1600℃真空熱處理2h可以基本上消除Mo5Si3C相，得到只有MoSi2和SiC兩相的均勻材料。

Abstract:采用直接化學(xué)鍍鎳的方法,得到了光亮且均勻、致密的Ni-P鍍層。在分析鍍層形貌、化學(xué)成分和組織結(jié)構(gòu)的基礎(chǔ)上,測(cè)定了鍍層厚度、硬度、結(jié)合力、阻抗及耐蝕性。結(jié)果表明：改進(jìn)后的化學(xué)鍍鎳層與基體結(jié)合良好；硬度達(dá)479×9.8 MPa,400℃熱處理后可提高至826X9.8 MPa；阻抗為0.4 Ω,且隨熱處理溫度的提高呈下降趨勢(shì)；鍍層耐腐蝕性能良好,熱處理后耐蝕性有所下降。

Abstract:The thermal conductivity of W-Cu composites is affected by the position where they were placed in during infiltrating. The W-Cu composites after infiltrating were kept at a certain temperature for some hours with the protection of hydrogen and then cooled down to room temperature by different means. By X-ray diffraction experiment, tungsten phase is found to be under compression and copper phase under tension. The value of the residual stresses increases with the cooling rate, while the thermal conductivity, inversely. The coefficient of thermal expansion(CTE) mismatch of tungsten and copper led to the significant amount of thermal stresses at the interface and low thermal conductivity. The effect of the residual stresses on the thermal conductivity, as well as its mechanism was analyzed.

Abstract:探討了高溫下噴丸強(qiáng)化（SP）因素（殘余壓應(yīng)力引入、表面粗糙度增大、表面加工硬化等）對(duì)Ti811鈦合金微動(dòng)疲勞（FF）抗力的作用規(guī)律和機(jī)制。結(jié)果表明，SP處理可以有效地提高350℃高溫下Ti811合金的微動(dòng)疲勞抗力，但對(duì)500℃下FF抗力有不利影響：SP引入的表層殘余壓應(yīng)力增加裂紋閉合力，是SP提高350℃高溫下鈦合金FF抗力最為重要的因素，SP表面加工硬化的作用為次要因素；SP造成的粗糙度增大在350℃和500℃高溫下對(duì)鈦合金的FF抗力呈現(xiàn)出不利的作用，原因是表面機(jī)械損傷的影響突出，這種影響與殘余壓應(yīng)力的存在狀態(tài)有關(guān)。

Abstract:The research is carried out about the microstructure, mechanical properties, deformation and fracture feature of 93 W alloy deformed by hydrostatic extrusion. The result shows that the strength of tungsten alloy increases with the increase of the deformation amount, the elongation of tungsten alloy decreases with the increase of the deformation amount; The deformation initiates from binder phase. The deformation is typical two-phase harmonious deformation, the crack generate from the W-W interface; The ratio of W particle cleavage in fracture surface of deformed tungsten alloy is greater than that of undeformed.

Abstract:采用液相燒結(jié)法（LPS）制備了TiC／Ti復(fù)合材料，借助X射線衍射（XRD）分析了復(fù)合材料的相構(gòu)成。對(duì)TiCFFi復(fù)合材料進(jìn)行了高溫壓縮和高溫?cái)D壓實(shí)驗(yàn)，利用掃描電鏡（SEM）和光學(xué)顯微鏡（OM）分析了復(fù)合材料高溫變形前后的微觀組織。實(shí)驗(yàn)結(jié)果表明：基體Ti與燒結(jié)助劑中的Cu發(fā)生反應(yīng)生成玻璃相TiCu2。在高溫塑性變形過程中，由于液相TiCu2的存在，使復(fù)合材料表現(xiàn)出良好的高溫塑性變形能力，壓縮率達(dá)到72．9％，擠壓比為16：1：復(fù)合材料高溫塑性變形后，材料中的孔洞明顯減少，致密度得到提高，組織成分保持穩(wěn)定：處于液相狀態(tài)的TiCu2高溫?cái)D壓后，細(xì)化成尺寸為1μm～2μm的小顆粒，均勻分布于基體Ti顆粒的周圍。

Abstract:The extreme high temperature oxidation behavior of commercial pure titanium was researched by Gleeble-1500 thermal simulator. The results show that the weight gain increase continually with the increase of the oxidation temperature and the time of holding temperature. There are several oxide layers at extreme high temperature. Oxygen diffuses from the path in the cracked outer oxide layer into rather compact inner oxide layer and further into metal, which actualize the commercial pure titanium's oxidation at extreme high temperature.

Abstract:HDDR法生產(chǎn)Sm2Fe17Nx磁粉的關(guān)鍵是獲得細(xì)小的晶粒。通過XRD，SEM，EDX等手段研究了Sm2Fe17合金粉在脫氫-再化合過程中的相及微觀結(jié)構(gòu)的演化規(guī)律。結(jié)果表明：在真空條件下，650℃時(shí)，已經(jīng)歧化為SmHx和α-Fe的合金粉的脫氫-再化合開始，先形成非穩(wěn)定的TbCu7結(jié)構(gòu)的SmFe7相，隨著再化合溫度的升高，SmFe7相逐漸向穩(wěn)態(tài)相Sm2Fe17轉(zhuǎn)變，在850℃時(shí)轉(zhuǎn)變完全；在再化合過程中，合金粉的顆粒大小不發(fā)生變化，但內(nèi)部晶粒已經(jīng)明顯細(xì)化；850℃脫氫-再化合lh。晶粒大小約50nm。

Abstract:用熔體快淬法和晶化熱處理工藝制備Nd10．5Fe78-xCo5ZrxB6．5（x=0，2，3，4，5）納米晶雙相永磁材料，研究了其磁性能與結(jié)構(gòu)的變化。結(jié)果表明：適量地添加（2at％）Zr能顯著提高合金的內(nèi)稟矯頑力，并且可以有效抑制合金中的軟、硬磁相的晶粒長大，獲得晶粒尺寸為20nm的微觀結(jié)構(gòu)，使得合金中的軟磁相和硬磁相發(fā)生比較充分的交換耦合作用，從而有效地提高合金的磁性能。

Abstract:Al-Ti-C master alloys used as grain refiners of the aluminum and its alloys have been prepared by self-propagating high-temperature synthesis (SHS) technology. The influence of pressure, diameter and preheating temperature of green-pellet on combustion temperature (T_c) during preparing Al-Ti-C master alloy and the microstructure of synthesized product has been investigated. The results show that synthesized master alloy consist of Al, Al_3Ti and TiC, and green-pellet pressure and preheating temperature have remarkable influence on combustion temperature (T_c) and microstructure of synthesized product. However, in this study, the influence of green-pellet diameter is unapparent.

Abstract:采用CVD（Chemical Vapor Deposition）法沉積的鎢涂層有[100]／[111]／[110]擇優(yōu)取向。擇優(yōu)取向主要受氣體組分、流動(dòng)速度、溫度等因素的影響。研究了鉬基體上CVD鎢涂層的表面形貌和織構(gòu)、涂層界面的元素分布、涂層的抗熱震性能及高溫?cái)U(kuò)散性能。結(jié)果顯示：鎢涂層與基體鉬有2μm左右的互擴(kuò)散層且鉬在鎢中的擴(kuò)散速度更高；涂層在通H2條件下，進(jìn)行室溫→1400℃→室溫20次循環(huán)后涂層不脫落、界面沒有明顯變化，涂層結(jié)合力好；涂層界面上的雜質(zhì)元素氧等影響涂層的結(jié)合性能。