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Abstract:通過差示掃描量熱技術(shù) ,研究了熱循環(huán)對 Cu- 2 3.6 Zn- 4 .4 7Al- 0 .2 3Mn- 0 .17Ni形狀記憶合金中雙可逆相變的影響。結(jié)果表明 ,X→ M轉(zhuǎn)變溫度隨熱循環(huán)的進(jìn)行而降低 ,而馬氏體逆轉(zhuǎn)變的溫度幾乎不發(fā)生變化。

Abstract:Mechanism underlying the formation of dislocation is expounded on Thomas Fermi Dirac Cheng(TFDC) electron theory. The criterion condition on the limit size of dislocation is raised, and the calculated results of the limit sizes of a set of elements are given.

Abstract:研究了β型Ti40阻燃鈦合金高溫長期作用的第二相及其對性能影響，Ti40合金高溫長期作用后，從β相中析出Ti5Si3相和α相，采用常規(guī)鍛造工藝不高于540℃熱暴露100h,Ti5Si3相沿晶界不連續(xù)分布，降低合金熱穩(wěn)定性能，700℃熱暴露100h，Ti5Si3相明顯，大大降低合金熱穩(wěn)定性能，合金呈脆性沿晶界斷裂，采用等溫鍛造工藝540℃熱暴露100h，晶內(nèi)析出粗大的Ti5Si3相和α相，熱穩(wěn)定性能嚴(yán)重降低，呈宏觀脆性斷裂，采用常規(guī)鍛造工藝合適的熱處理制度，540℃，100h,250MPa蠕變作用后Ti5Si3相沿晶界不連續(xù)分布，合金有較好的蠕變性能，若熱處理工藝不當(dāng)，合金中有大量粗大的棒狀Ti5Si3相和α相析出，Ti5Si3 相沿晶界連續(xù)分布，合金的蠕變抗力明顯降低，采用等溫鍛造工藝蠕變作用后，合金中析出大量粗大的α相，合金蠕變抗力也明顯降低。

Abstract:The GHM(Golla Hughes McTavish) model of ZN 1 Viscoelastic Material is combined with finite element method (FEM), which is the most frequently used method in Engineering. It can approach time consuming iteration in solving model parameters and responses by introducing dissipation coordinates . The parameters of GHM model are determined by nonlinear curve fitting in complex frequency domain. This is converted into nonlinear optimization problem with constrained condition. The results show that the method proposed in the present paper to determine the parameters of GHM model is correct, simple and effective to employ GHM model to perform dynamic analysis.

Abstract:Author has solved the sputtering transport equation and obtained a new general solution from the power law cross section. This solution also provided a new evidence to SC solutions proposed by author recently. In addition, author further analyzed the new transport theory published by Vicaned et al. A lot of calculations have been done to demonstrate that the agreement between Vicaned's theory and Monte Carlo computer simulation is not true.

Abstract:采用連續(xù)波2kW YAG激光器在6061鋁合金表面激光熔覆NiCrBSi合金，利用掃描電子顯微鏡（SEM／EDX），X射線衍射儀等分析檢測設(shè)備研究熔覆層的組織形貌，化學(xué)成分及相組成，利用超超波感應(yīng)空泡腐蝕設(shè)備對熔覆層在3．5％NaCl水溶液中的空泡腐蝕性能進(jìn)行了系統(tǒng)評價(jià)，從而總結(jié)出激光熔覆層及基材的空泡腐蝕機(jī)制。

Abstract:Based upon the mechanism of conventional rapid form, the thin wall parts of 316L stainless steel were obtained through the laser melting of metallic powders which were delivered coaxially and then deposited on the substrate layer by layer. The obtained microstructure is fully dense and evenly distributed with the characteristic of rapid solidified microstructure. The mechanical properties are equivalent to that of casting and wrought annealed materials, suitable to the requirement for real usage.

Abstract:研究了先用Murakami劑浸蝕WC相，再用（H2O2＋H2SO4）酸混合液除去o相的2步法浸蝕YG6硬質(zhì)合金基體表面預(yù)處理的過程，并在浸蝕過的硬質(zhì)合金基體上，用熱絲法沉積了金剛石薄膜，結(jié)果表明：2步浸蝕法可在基體表面深度為6μm-12μm的范圍內(nèi)，使Co含量從6％降低到0．54％－3．22％，并使硬質(zhì)合金基體的表面粗糙度增加到Ra=1.0μm，但會導(dǎo)致硬質(zhì)合金基體表面的硬度從89．9HRA降低至88．1HRA，在該硬質(zhì)合金基體沉積金剛石薄膜之后，發(fā)現(xiàn)金剛石薄膜試樣的組織結(jié)構(gòu)具有明顯的｛111｝面取向，金剛石涂層與硬質(zhì)合金基體具有較高的粘結(jié)強(qiáng)度。

Abstract:The titania layer containing calcium and phosphate on titanium alloy substrate was formed by microarc oxidization and converted to the bioactive titania layer containing hydroxyapatite by subsequent hydrothermal synthesis. The porous bioactive layer has a high bonding strength. So, this technique is very suitable for the bioactive surface modification of titanium alloy implants.

Abstract:通過對兩元 p-型梯度熱電材料 Fe Si2 / Bi2 Te3界面溫度的建模計(jì)算與實(shí)驗(yàn)驗(yàn)證 ,在固定熱冷端溫區(qū)內(nèi)積分得出的 Z- ΔT值與界面溫度 Ti 的關(guān)系曲線為 :Z- ΔT =0 .6 72 +11.7× 10 - 4Ti - 1.31× 10 - 6 T2i - 3.4 9× 10 - 9T3i該關(guān)系可用來表征兩元梯度結(jié)構(gòu)的熱電性能。從擬合曲線上得出該梯度結(jié)構(gòu)的最佳界面溫度為 2 2 0℃～ 2 30℃ ,這與實(shí)驗(yàn)測出兩單段材料 (Fe Si2 ,Bi2 Te3)長度比為 10∶ 1左右時所形成的界面溫度較為接近。通過測試不同長度比的材料輸出功率 ,也發(fā)現(xiàn) 10∶ 1梯度材料的最大輸出功率較大 ,是相同溫差下單段 β- Fe Si2 材料的 2倍～ 2 .6倍。

Abstract:Nanostructured AgSnO 2 powders were prepared by high energy ball milling. After hot press sintering, the nanostructured AgSnO 2 contact materials were obtained. Compared with the AgSnO 2In 2O 3 prepared by internal oxidation with clustered at crystal boundary, the nonostructured AgSnO 2 Composite bulk has the microstructure with nano scaled SnO 2 particles dispersed on the silver matrix.

Abstract:采用X射線分析方法的一種線對法研究了LaNi4.75Al0.25合金及氫化物的晶胞參數(shù)及其隨氫含量的變化規(guī)律，并將實(shí)驗(yàn)結(jié)果與La-Ni-Al系列的文獻(xiàn)值進(jìn)行比較，實(shí)驗(yàn)結(jié)果表明：在LaNi4.75Al0.25吸氫發(fā)生的相轉(zhuǎn)變，即α→α＋β→β過程中，β相的晶胞參數(shù)比α相的參數(shù)大，并且α相與β相的晶胞參數(shù)在壓力－組成－溫度曲線（P－C－T）的平臺段幾乎不變，當(dāng)LaNi4.75Al0.25完全變成氫化物時，β相的晶胞參數(shù)又會略有增大，LaNi4.75aL0.25H5.6的晶胞體與未吸氫時相比增大了22．05％。

Abstract:討論了定向凝固法制備YBCO超導(dǎo)體涉及的包晶轉(zhuǎn)變與包晶反應(yīng)，成分過冷，擴(kuò)散控制生長模型，界面效應(yīng)及定向凝固YBCO生長晶體學(xué)等問題。

Abstract:The creep behavior of Ti alloys is complicated and can usually be divided into low temperature creep, grain boundary slip creep, diffusion creep and dislocation creep, so on. Some important factors, such as temperature, time and microstructure, influence the creep property of Ti alloys due to the different creep types. This paper reviews the effects of creep parameters, microstructure, and Si element on the dislocation creep behavior of Ti alloys, and the possible mechanism of improving the creep resistant of alloys are also discussed.

Abstract:The properties of the La 2O 3 doped molybdenum powder have been studied. The La 2O 3 nanoparticles on the surface of molybdenum powder can decrease the intensity of loss peak of molybdenum matrix but increase the peak of Mo3d by the reduction of La(NO 3) 3 doped MoO 2 by hydrogen. The surface of molybdenum powder exposed to the atmosphere can be reduced because the surface is mainly covered by La 2O 3 nanoparticles around molybdenum powder, as a result, the capability of antioxidation of molybdenum can be improved.

Abstract:用粉末冶金熱壓方法制備了幾種含不同稀土化合物（LaF3,CeO2,La2O3)的Ni-Cr基自潤滑合金，測試了合金機(jī)構(gòu)性能和高溫摩擦磨損性能，研究結(jié)果表明，未添加稀土化合物的合金密度和彎強(qiáng)度最高，對添加稀土化合物的合金，以添加CeO2合金的密度，硬度和抗彎強(qiáng)度最高，添加稀土化合物均能降低合金的摩系數(shù)和磨損率，尤其是以添加La2O3合金的摩擦系數(shù)損率在各溫度下都最低，X射線射分析結(jié)果表明，在合金中添加稀土化合物，增加了合金中鎳基固溶體的晶面間距，尤其以添加La2O3合金中鎳基固溶體的晶面間距最大，這和其摩擦系數(shù)最低的實(shí)驗(yàn)結(jié)果相一致。

Abstract:研究了在modified-ψ衍射幾何條件下，鈹材表層中存在不同應(yīng)力梯度時的d-sin^2ψ曲線的形狀，確定了鈹材表層內(nèi)的應(yīng)力梯度對常規(guī)的X射線應(yīng)力測試的影響，結(jié)果表明：在通常的sin^2ψ≤0．5的應(yīng)力測試范圍內(nèi)，應(yīng)力梯度對測試曲線有明顯的影響，應(yīng)力測試值因應(yīng)力梯度的存在而偏離真實(shí)值，選擇合適的靶材以減小X射線對鈹材的穿透深度，可以減小應(yīng)力測試的誤差。

Abstract:采用自蔓延高溫合成（SHS）技術(shù)，進(jìn)行Ti-Ni-Nb形狀記憶合金（SMA）的燃燒合成試驗(yàn)，研究了粉末粒度，純度和加熱溫度對熱爆燃燒合成的產(chǎn)物組織的影響，結(jié)果表明：純度高的粉末，粒度細(xì)的鈮粉和粒度適中的鈦粉，有利于獲得密度高和（Ti,Nb)2Ni等雜相少的產(chǎn)物，當(dāng)溫度尚達(dá)到熱爆溫度時，只能發(fā)生常規(guī)反應(yīng)燒結(jié)，當(dāng)達(dá)到熱爆溫度時，熱爆的產(chǎn)物內(nèi)存在著基體相（Ti,Nb)Ni，雜相（Ti,Nb)2Ni和由β－Nb(Ti,Ni)與基體（Ti,Nb)Ni形成的共晶相，在較高的熱爆溫度下，共晶相基本消失，基體晶粒粗化。

Abstract:以2090鋁鋰合金為對象，研究了稀土元素Ce和預(yù)變形對其時效過程的影響，結(jié)果表明：微量Ce(0.11%),能顯著彌散T1相，使T1相均勻，細(xì)小地析出，且在峰時效態(tài)表現(xiàn)明顯，但Ce對δ′相的相變過程影響不大，預(yù)變形使合金位錯密度增大，減小了T1相的形核功，從而促進(jìn)了T1相和δ′相析出；微量稀土元素Ce(0.04%-0.14%)和預(yù)變形（3％－9％）配合使用可達(dá)到更好的綜合性能效果。