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Abstract:Biaxial low cycle fatigue properties of the alloy Zr-4 have been studied for the principal strain ratios (ε₃／ε₁) of -0.8，-0.7，-0.6，-0.5 and the equivalent strain ranges of 0.5%，0.7%，0.8%，0.9%，1.0%，1.1%.The results show that the al

Abstract:The microstructure of a monolithic Ll₂ Al₆₇Mn₈Ti₂₅ compound changes significantly when modified with a small amount of Nb (0.2～4.0at%) and with corresponding adjustments to the Ti and Al contents. In 32 exper

Abstract:Effect of pellet diameter on the combustion velocity and temperature profile in the combustion synthesis of Al₂O₃-TiC ceramics and microstructure change in the radial direction of the cylindrical products were investigated. For a

Abstract:The LaNi₅ alloy is a typical hydrogen-storage material. On the basis of the empirical electron theory of solids and molecules(EET), the valence electron structures of the LaNi₅ alloy and bond energies of main bonds between upper strata and lower strata for substitution of Co andor Mn for partial Ni in the LaNi₅ alloy are calculated. The results indicate that these bond energies increase when Mn is subslituted for Ni₂, or Co is substituted for Ni₁ or Ni₂. When both Mn and Ni are substituted for Ni, the bond energies increase greatly. as a result of which the lifetime of the LaNi₅ alloy increases.

Abstract:測(cè)量了再結(jié)晶態(tài)Ｔａ－１２Ｗ合金板的室溫至１６００℃的拉伸性能。在室溫下拉伸，Ｔａ－１２Ｗ合金展示出良好的固溶強(qiáng)化和優(yōu)良的延性。提高試驗(yàn)溫度，合金的強(qiáng)度和延性均逐漸下降。

Abstract:研究了Zr-4合金管材在主應(yīng)變比ε3／ε1=-0.8，-0．7，-0．6，-0．5和等效應(yīng)變幅0．5％，0．7％，0．8％，0．9％，1．0％，1．1％下的低周多軸疲勞性能。結(jié)果表明：在拉-扭比例加載過程中，再結(jié)晶狀態(tài)Zr－4合金表現(xiàn)為初期短暫硬化，隨后持續(xù)軟化的特性。Zr－4合金的循環(huán)等效應(yīng)力-應(yīng)變曲線位于單調(diào)曲線的上方，表現(xiàn)為循環(huán)硬化。主應(yīng)變化對(duì)循環(huán)硬化曲線沒有影響。相同Mises等效應(yīng)變幅下，應(yīng)變比越大，疲勞壽命越低。雙軸疲勞過程中，Zr－4合金Mises等效應(yīng)變幅與疲勞壽命之間呈指數(shù)關(guān)系。

Abstract:研究了ＤＺ４０Ｍ鈷基合金低壓氣相沉積簡(jiǎn)單鋁化物和鈦改性鋁化物２種涂層的形成及其高溫氧化時(shí)的相變退化過程。

Abstract:研究了壓坯直徑對(duì)燃燒合成Al2O3－TiC陶瓷的燃燒速度和溫度的影響以及圓柱試樣的徑向微觀組織變化。燃燒合成的圓柱試樣軸心區(qū)直徑1．5μm～5.5μm的圓形顆粒為TiC，具有熔化特征的邊長10μm～20μm的多邊形為含有少量TiC的剛玉；在二分之一半徑處，TiC顆粒和剛玉塊的尺寸分別減小為0．1μm～3μm和5μm～15μm；但在靠近合成試樣圓周及其圓柱表面，剛玉變成為了晶須，TiC則是0．1μm－0．5μm的微小顆粒組成的團(tuán)聚體。這是因?yàn)樵嚇釉谌紵铣蛇^程中沿周向和徑向均有熱量傳遞，燃燒過程中徑向不同位

Abstract:The LaNi5 alloy is a typical hydrogen-storage material. On the basis of the empirical electron theory of solids andmolecules (EET), the valence electron structures of the LaNi5 alloy and bond energies of main bonds between upper strata andlower strata for substitution of Co andor Mn for partial Ni in the LaNi5 alloy are calculated. The results indicate that these bondenergies increase when Mn is subslituted for Ni2, or Co is substituted for Ni, or Ni2. When both Mn and Ni are substituted forNi, the bond energies increase greatly. as a result of which the lifetime of the LaNi5 alloy increases.

Abstract:The microstructure of a monolithic Ll2Al67Mn8Ti25, compound changes significantly when modified with a small amount ofNb (0. 2~4. 0at%) and with corresponding adjustments to the Ti and Al contents. In 32 experimental alloys near the Al3Ti-8Mncomposition region of the Al-Ti-8Mn-Nb quaternary system, five multiphase regions. Ll2+Al2Ti, Ll2+DO22, Ll2+Ll0, Ll2,+Al2Ti+DO22 and Ll2+Al2Ti+Ll0 formed adjacent to the original Ll2 single phase. When Nb content keeps constant, the plate-like or nettyAl2Ti phase precipitates appear with the decrease of Al/Ti ratio. The ripple-like Ll0 AlTi phase may appear in the alloys containedhigher Nb c0ntents. A room temperature constitutional diagram near the Al3Ti-8Mn region of Al-Ti-Nb-8Mn quaternary system hasbeen determined.

Abstract:對(duì)不同表面狀態(tài)的Ｚｒ－４管材在５００℃，１０．３ＭＰａ下的過熱蒸汽中進(jìn)行了腐蝕試驗(yàn)。實(shí)驗(yàn)證明：表面處理狀態(tài)對(duì)合金抗癤狀腐蝕性能有較大影響。經(jīng)酸洗后可提高抗癤狀腐蝕性能，預(yù)生氧化膜處理可起到延緩癤狀腐蝕的作用。結(jié)果表明，酸洗后預(yù)膜處理的表面有最好的抗癤狀腐蝕性能。

Abstract:The composition of a machineable glass ceramic containing ZrO2 was optimized using machineability testing. The effects ofK2O, CaO, MgO and Al2O3 on the machineablity of the glass ceramic were studied and the results analyzed in terms of the relationship between crystallization 0f a mica phase and composition of the bulk. The XRD result shows that the glass ceramic after optimization contains a large amount of tetragonal ZrO2 and mica phases.

Abstract:Impact attrition is an advanced technique for the production of bery1lium powder. As compared with discattrited powder, it has many advantages: narrow range of particle distribution, near-spherical particle shape and lower oxygen content. Themechanical properties and isotropy of the resulting hot-pressed or isostatic-pressed compacts are in general improved.

Abstract:On the basis of an in-depth analysis of the evaporation process of alloying elements during induction skull melting (ISM) amodel for the control mode of element evaporation has been established. The calculated results of Al element evaporation in Ti-48Al-2Cr-2Nb (at%) and Ti-24Al-11Nb (at%) alloys show that when melt temperature increases and/or pressure decreases, the controlmode of Al element evaporation changes from an evaporating reaction control mode at low melt temperature and/or under high outerpressure to a double control mode-evaporating reaction and liquid phase diffusion at high melt temperature and/or under low pressure. When the outer pressure is 133.3 Pa, the transformation temperatures of the control mode of Al element evaporation are approximately 1950 K and 2000 K respectively for the Ti-48Al-2Cr-2Nb (at%) and Ti-24Al-11Nb (at%) alloys. While the transformation pressures of the same alloys are approximately 133. 3 Pa and 66 Pa respectively when the melt temperature is 2073 K. Thereason is that the saturated vapor pressures of Al element in various alloys are different.

Abstract:A new manufacturing method for special gold matrix three-ply composites microtape is presented, and compared withcommon methods which have been employed elsewhere in the world. The new method utilizes the techniques of:explosion composite-forming, diffusion welding (or brazing),groove rolling,special die drawing and finish rolling using 12-roll micromill.

Abstract:The determination of fracture toughness of brittle materials is often conducted using three-point bend beam method, in which the initiating crack is usually in the form of a diamond-sawed notch. In this paper a model of the fracture process is proposed. The model can be used to predict the fracture toughness from the apparent toughness and microstructural parameters, where the apparent toughness is measured using the sawed-notch crack method. The dependence of K_IC on the notch root radius was examined in two kinds of polycrystalline alumina and one soda-lime glass for notch radii as small as a few micrometers, The results show that when the notch radius is near to or smaller than the average grain diameter, the toughness is almost constant. When the critical notch radius used for determining toughness is approximately equal to the average grain diameter, a true measure of fracture toughness can be obtained.