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Abstract:The valence of lanthanum on the surface of carburized La 2O 3 Mo cathode material has been studied using high temperature X ray photoelectron spectroscopy(XPS). The experimental results show that La 2O 3 in the La 2O 3 Mo cathode material can be reduced to metalic lanthanum by molybdenum carbide (Mo 2C). The binding energy of metallic lanthanum is higher than that of La 2O 3, The La3d5/2 binding energy of metallic lanthanum has been proved to be 835 96 eV experimentally. This paper reports for the first time that the experimental La3d3/2 binding energy of metallic lanthanum is 852 23 eV .

Abstract:對(duì) (Ml) x(Ni3.8Co0 .75Mn Ti0 .0 5)合金 (x =0 .90～ 1 .1 0 )的相結(jié)構(gòu) ,熱力學(xué)性能及合金電極的充放電性能進(jìn)行了研究。結(jié)果表明 :在 x <1 .0 0的成分范圍內(nèi) ,合金保持單一的 La Ni5相 ;當(dāng) x≥ 1 .0 0時(shí) ,合金中析出多種第二相 ,且總量隨 x的增加而增多。隨著 x的增加 ,合金的晶胞體積及氫化物生成焓 (-ΔH )增大 ,吸放氫平臺(tái)壓力降低 ,寬度增加。合金的最大放電容量在 x =1 .0 0 時(shí)達(dá)到最大值 (30 7.7m Ah/g)。x <1 .0 0 合金的循環(huán)穩(wěn)定性優(yōu)于 x≥ 1 .0 0 合金。

Abstract:研究了熱處理對(duì) Ml (Ni Co Mn Al) 4 .76合金電化學(xué)性能的影響。結(jié)果表明 :在 1 1 73K～ 1 373K下適當(dāng)?shù)臒崽幚砜梢燥@著提高貯氫合金電極的放電容量和高倍率放電性能 ;鑄態(tài)合金的放電容量為 31 0 Ah/kg,放電電流密度 id=30 0 A/kg時(shí) ,高倍率放電率 H RD30 0 =91 % ,id =1 2 0 0 A/kg時(shí) ,H RD12 0 0 =35% ;經(jīng) 1 1 73K,1 0 h熱處理的合金容量提高到 32 7Ah/kg,H RD30 0 提高到 97% ;經(jīng) 1 1 73K,3h熱處理的合金容量為 2 99Ah/kg,H RD30 0 提高到 98% ,H RD12 0 0 提高到 65% ;隨熱處理溫度的升高和時(shí)間的延長 ,導(dǎo)致合金電極的放電容量和高倍率放電性能下降。

Abstract:采用檸檬酸鹽溶膠 -凝膠法合成了組成為 Li Zn(P1- x Vx) O4 (x=0 ,0 .1 ,0 .2 ,0 .3,0 .4,0 .5)的離子導(dǎo)體 ,并對(duì)合成材料進(jìn)行了差示熱分析 (DTA)、熱重分析 (TG)、X射線衍射 (XRD)和透射電鏡 (TEM)等表征。實(shí)驗(yàn)結(jié)果表明 ,組成為 Li Zn PO4 的燒結(jié)體結(jié)構(gòu)為 α- L i Zn PO4 ;x=0 .4,0 .5的燒結(jié)體具有 Li Zn VO4 結(jié)構(gòu) ,為固溶體 (Li Zn VO4 )單相 ;而 x=0 .1 ,0 .2 ,0 .3的燒結(jié)體是由 α- Li Zn PO4 和 Li Zn VO4 兩相組成的。由于 α- Li Zn PO4 燒結(jié)體的相對(duì)密度極小 ,樣品在室溫下幾乎不顯示導(dǎo)電性 ;而摻雜了 V以后的樣品 ,隨著結(jié)構(gòu)和組成不同顯示出不同程度的導(dǎo)電性 ,其中以 x=0 .4時(shí)值最大 ,T=30℃時(shí) σ=4.55× 1 0 - 7S· cm- 1。

Abstract:Interstitial impurities in sintered Mo La 2O 3 bars have been investigated systematically using SEM, EDAX, XRD and AES. It has been shown that the bend strength and ductility of the sintered Mo bars are greatly improved by the addition of La 2O 3. Interstitial impurities not only exist in the Mo grains, but also segregate to the surface of the La 2O 3 particles and in so doing decrease impurity concentration of the grain boundary.

Abstract:利用預(yù)涂 Si粉對(duì) Ti- 6Al- 4V合金進(jìn)行激光表面合金化 ,制得以初生及共晶金屬間化合物 Ti5Si3為增強(qiáng)相的快速凝固“原位”耐磨復(fù)合材料表面改性層 ,研究了激光表面合金化 Ti5Si3/β- Ti耐磨復(fù)合材料表面改性層的顯微組織及其在干滑動(dòng)磨損及二體磨料磨損條件下的耐磨性能。結(jié)果表明 :利用 Si粉對(duì) Ti- 6Al- 4V合金進(jìn)行激光表面合金化處理后 ,合金層硬度及耐磨性大幅度提高。

Abstract:The fracture of titanium matrix composite reinforced by TiC particles has been studied. The results indicate that the proportion of defective particles will significantly influence the crack propagation rate. Regular and non defective particles will not fracture easily during the initial deformation, and hence will greatly enhance the crack extension energy. On the contrary, the easily broken particles enhance the extension stress at the crack tip, and hence the propagation rate of the crack. Suitable heat treatment will increase the crack extension energy, and improve the plasticity of the composite.

Abstract:通過設(shè)計(jì)滑移系直接受分切應(yīng)力的剪切試樣形式，對(duì)鎳基單晶超合金在７００℃、８５０℃和９５０℃時(shí)的瞬時(shí)剪切強(qiáng)度和剪切蠕變性能進(jìn)行了研究。試驗(yàn)結(jié)果表明，本研究試樣形式可以直接測量單滑移系的滑移規(guī)律，未發(fā)現(xiàn)晶體取向相關(guān)性。通過轉(zhuǎn)換公式，瞬時(shí)剪切強(qiáng)度與圓棒試驗(yàn)結(jié)果相吻合。應(yīng)用掃描電鏡（ＳＥＭ）對(duì)試樣斷口分析表明，斷口由平整的小刻面組成，從而進(jìn)一步驗(yàn)證本試驗(yàn)的有效性，同時(shí)發(fā)現(xiàn)，由夾雜形成的空洞和平行受載方向的

Abstract:The experiments of the hot cracking tendency of the alloys were carried out in the HRS directionally solidified device. Hot cracking tendency of directionally solidified Al Cu and Rene 125 alloys was evaluated with a semi quantitative method. Grain boundaries were observed. Its effect on hot cracking is analyzed and discussed. The analysis result with grain boundary's state is in accordance with experiment result. It is proved that grain boundary's state has important influence on the formation of hot cracks. The effects include weakening the binding energy between grains and compensating solidification shrinking in grain boundaries. The comprehensive influence of grain boundary state on hot cracking tendency of an alloy depends on the distribution and amount of the phases with low melting points in grain boundaries.

Abstract:The cyclic oxidation behavior of aluminide coatings made by low pressure chemical vapor deposition on to a new Co base superalloy DZ40M has been investigated. It was found that these coatings bonded well to the matrix well. Coating degradation when it occurs is due primarily to a depleting Al source as the oxide scale on outer surface is heated during cyclic oxidation. This degradation will be accelerated if Ti is added to the aluminizing reagent during deposition.

Abstract:采用圓環(huán)壓縮法，研究了Ａ５玻璃和石墨在ＴＣ４鈦合金高溫變形過程中的潤滑性能。結(jié)果表明：用Ａ５玻璃作潤滑劑，摩擦因子ｍ隨溫度的升高而減小，但在應(yīng)變速率小于０．０５ｓ＾－１，溫度高于９５０℃時(shí)，ｍ隨溫度的升高而增大；溫度低于９５０℃時(shí)，應(yīng)變速率對(duì)ｍ影響不大，而溫度高于９５０℃時(shí)，ｍ隨應(yīng)變速率的增大而減小。用石墨作潤滑劑時(shí)，摩擦因子ｍ隨溫度的升高和應(yīng)變速率的減小而增加。

Abstract:研究了浸漬和未浸漬樹脂碳?xì)止杌幚砗蟮娘@微組織。結(jié)果表明：未浸漬樹脂碳?xì)止杌幚砗箫@微組織為反應(yīng)生成的細(xì)小碳化硅顆粒均勻分布在游離硅中；而浸漬樹脂碳?xì)止杌幚砗蠓磻?yīng)生成的碳化硅顆粒粒徑大小不一，且分布不均勻。碳?xì)止杌玫剑樱椋樱椋脧?fù)相陶瓷的主晶相為α－ＳｉＣ、β－ＳｉＣ和游離Ｓｉ，不同晶型ＳｉＣ的出現(xiàn)與試樣燒結(jié)過程中Ｓｉ／Ｃ反應(yīng)的放熱過程有關(guān)。

Abstract:改變電流密度在鈦合金表面電結(jié)晶出磷酸鈣預(yù)涂層，經(jīng)堿液處理轉(zhuǎn)變?yōu)榱u基磷灰石（ｈｙｄｒｏｘｙａｐａｔｉｔｅ，ＨＡ）。掃描電鏡（ＳＥＭ），Ｘ射線衍射（ＸＲＤ）分析及拉伸實(shí)驗(yàn)與模擬體液實(shí)驗(yàn)表明：小電流密度預(yù)涂層為致密片狀ＣａＨＰＯ４－２Ｈ２Ｏ，隨電流密度增加涂層為疏松、細(xì)針狀Ｃａ３（ＰＯ４）２－ｎＨ２Ｏ，但經(jīng)過堿液處理都轉(zhuǎn)變?yōu)榱u基磷灰石；羥基磷灰石涂層的拉伸強(qiáng)度隨電流密度增加而降低，在模擬體液中的溶解較弱

Abstract:The TiAl based alloys with various compositions were prepared by powder metallurgy(P/M), and their microstructures and mechanical properties studied. It was shown that homogeneous Ti Al Cr Nb alloys with fine microstructures can be obtained by means of powder metallurgy. The addition of alloying elements has a significant effect on the microstructure; for example additions of Cr and B will refine the grain size. The mechanical properties of the P/M Ti Al based alloys are related to their microstructures. The finer the microstructure, the higher the room temperature strength and ductility. At high temperatures the strength increases with increasing grain size. P/M processed Ti 47Al 3Cr was found to have good room temperature properties : an ultimate strength of 526 MPa and an elongation of 1 5%.

Abstract:The influence of partial substitution of Cr for V on the activation of TiMn based hydride electrodes has been investigated. The results indicate that the partial substitution of Cr for V is favourable for increasing the activation of TiMn based alloys. High discharge capacity (397mAh/g) can be obtained for 1 at% Cr content However, with increasing Cr content. the activation and discharge capacity of the alloy decrease. X ray results indicate that there are two main phases existing in the alloy:V rich V 3Ni 2 and Ti rich TiMn 2.

Abstract:Cemented carbides of the type WC 8(Fe/Ni/Co) R were made by means of adding minor rare earth elements( R ) and a Fe Ni binder (partly substiting for the Co binder) and their physical and mechanical properties were tested. The influences of various compositions and sintering temperatures on the properties of the alloys have been studied. The results indicate that the properties of the WC 8(Fe/Ni/Co) R cemented carbides are comparable to those of the WC 8Co alloys. The microstructures of the alloys were studied using scanning election microscopy (SEM) and X ray diffraction. Some factors that influence the properties of the WC 8(Fe/Ni/Co) R alloys are discussed in detail.

Abstract:提出一種在氰化物基電解液中純金材料的電化學(xué)拋光方法。討論了電解液組成和陽極電流密度對(duì)純金材料表面光亮度的影響。實(shí)驗(yàn)結(jié)果表明：采用氰化物基電解液，陽極電流密度控制在３５Ａ／ｄｍ＾２，溫度３０℃～４０℃，拋光時(shí)間２ｍｉｎ～５ｍｉｎ，可使表面光亮度提高到原來的兩倍多。

Abstract:A method of TEM sample preparation for melt spun Nd Fe B powders is presented. The TEM samples were prepared by mixing the Nd Fe B powders (30% in volume) with pure aluminium powders, followed by blending, compacting into pellets, rolling into flakes, punching, grinding and ion sputter thinning.

Abstract:The functions and characteristics of photographic databases are presented for nonferrous metals exposed to seawater. As an example, the corrosion data are compared to the phatographs for Cu Sn bronze. The results show the relatively high susceptivity to temperature of bronze exposed to seawater.