Qi Baosen , Yao Xin , Wang Chengguo , Xu Ying
2000(2).
Abstract:通过 X射线衍射、SEM分析及显微硬度测试等手段 ,研究了 Cr80 Al2 0 混合粉末机械合金化过程中的组织、相结构及硬度等的变化。结果表明 ,Cr80 Al2 0 混合物粉未经 96 h机械合金化后 ,其组织为 Cr(Al)的过饱和固溶体加上η - Al Cr2 金属间化合物
Ma Jianxin , Pan Hongge , Li Shouquan , Wang Xinhua , Chen Changpin
2000(2).
Abstract:系统地研究了 Fe0 .85 Mn0 .1 5 Ti0 .9M0 .1 (M=Zr,V,Ca)合金的贮氢性能。研究结果表明 :Fe0 .85 Mn0 .1 5 Ti0 .9Zr0 .1 合金在室温下经几分钟的孕育期就可吸氢 ,但合金在氢化过程中形成了氢含量很高的α相 ,导致合金的贮氢量降低 ,同时还使 p- c- T曲线的平台特性变差 ;Fe0 .85 Mn0 .1 5 Ti0 .9V0 .1 合金的活化性能进一步得到改善 ,在室温下几乎不需要孕育期就可以吸氢 ,但同时要降低合金的贮氢量 ,而对合金的 p- c- T曲线平台特性影响不明显 ;用 Ca取代 Fe0 .85 Mn0 .1 5 Ti合金中的部分 Ti则对合金的贮氢性能影响不明显。通过 XRD分析认为 ,上述性能的变化主要与合金中出现第二相有关
Hu Jiming , Wu Jixun , Meng Huimin , Lu Yanping , Zhu Yanrong , Yang Dejun
2000(2).
Abstract:通过热重分析和差热分析并结合 X射线衍射技术对 Ir O2 +Ta2 O5 混合氧化物的热形成进行了研究。结果表明 :摩尔分数 x<2 5 %时 ,在混合氯盐体系 x H2 Ir Cl6 +(1- x)Ta Cl5 中 ,热解产物中的固溶体为β相 (β- Ta2 O5 中固溶了 Ir组元 ) ;x≥ 2 5 %时 ,生成的固溶体为固溶了 Ta组元的 Ir O2 金红石相 ,而且数量在两个以上 ;只有当 x≥ 42 .86 %时 ,其中的金红石相固溶体才是稳定的。 Ir和 Ta组元在热解过程中相互促进的作用强度顺序为 :x=5 .2 6 %
2000(2):78-81.
Abstract:The RE containing superconducting materials, especially high temperature RE cuprate superconductors which have been discovered since 1986, are briefly introduced. The advances in the technology and applications of these materials are also described. It is indicated that the RE Ba Cu O superconductors, especially NdBCO bulks, are better than the YBCO for patch production, and exhibit the economic potential.
Zhang Dongming\+ , Fu Zhengyi\+ , Zhang Shouguo\+
2000(2):82-85.
Abstract:Recent development of theory and application of the RUSM (rhomb unit structural model) for amorphous alloys are reviewed.The RUSM is compared with some other models. The relationships between structure, composition and property established by the RUSM are presented. The hydrogen storage of amorphous alloy is calculated based on the RUSM.
Yu Zhentao , Zhou Lian , Deng Ju , Gu Haicheng
2000(2):86-89.
Abstract:利用X射线衍射极图测量技术,研究了Ti-2Al-2.5Zr合金轧制、拉拔管材的退火织构,并与轧制板材的织构进行了对比分析,结果表明:轧制管材环向主织构由棱锥织构{1015}和基面积构(0001)等组成:而轴向主织构则包括棱柱织构{1010}和{1120}等棱锥织构;拉拔管材退只构类型与轧制管材相似,但其主织构盛会中度与轧制管材相比则发生较大变化;冷轧板材的退火织构随温度升高而发生转变。
Qu Henglei , Zhou Lian\+ , Wei Hairong\+\ ,
2000(2):90-93.
Abstract:将5种铸态TiAl置于700℃~1000℃静止空气中断续氧化100h。采用XRD和SEM/EDS分析技术,观察分析了TiAl氧化后的表面形貌、相组成及分布状况,结果表明:氧化产物主要为金红石型R-T和刚玉型α-A12O3;低温、短时氧化时,氧化产物呈混合形式存在;高温、长时化时,在混合氧化物之外易形成纯R-TiO2晶体层。
Liu Peisheng , Fu Chao , Li Tiefan
2000(2):94-100.
Abstract:基于三维网状高孔率金属材料的结构特点,建立其简化的几何结构模型,根据该模型,运用有关几何与力学理论,导出了这种材料抗拉强度的计算公式。该公式将抗拉强度与孔率θ通过(1-θ)的幂次项型式联系在一起。最后,用有关实验测试证明了计算公式的应用效果是良好的。
Song Guiming\+ , Bai Houshan\+ , Zhou Yu\+ , Wang Yujin\+
2000(2):101-104.
Abstract:运用扫描电镜(SEM)研究了ZrC颗粒增强钨基复合材料(ZrCp/W,ZrC颗粒体积分数为30%)在1000℃高温的断裂行为。结果表明:高温下,复合材料断裂过程是“微裂纹萌生-裂纹连接长大一裂纹快速扩展-材料断裂:;复合材料中的ZrCp为脆性断裂,W基体有韧性断裂迹象;随温度升高,W基体发生了脆塑转变,W基体的塑性在一定程序上延缓了裂纹的扩展速率,降低了材料对裂纹的敏感性,基体在断裂前发生一定塑性
Zhang Jinxu , Ge Honglin , Chen Xiaoying , Wang Xiaoying , Xu Jialong
2000(2):105-108.
Abstract:研制出一种以 Ti2 Co相弥散强化 α- Ti基体的钛合金 Ti- 8Co- 5 Al。实验表明 ,在变形温度为 72 5℃ ,应变速率为 1× 10 - 3s- 1 的条件下可获得断裂延伸率 70 8%。从实测应变速率敏感性指数为 0 .47,并结合试样断口处纵向剖面显微组织的扫描电镜观察 ,表明在Ti- 8Co- 5 Al合金中发生了α- Ti晶界及α- Ti/ Ti2 Co相界的滑移为主要变形机制的变形过程。采用 Ti- 8Co- 5 Al合金在 730℃和 1× 10 - 3s- 1 应变速率条件下成功地等温锻造出飞机零件 ,比 Ti- 6 Al- 4V合金低约 2 10℃
Zeng Dawen , Xia Hui , Xie Changsheng
2000(2):109-113.
Abstract:Laser cladding was done on the 45 # steel substrate using an auto feeding powder method. Effect of scanning speed on the microstructure and solidification process of the laser cladd Ni alloy have been systematically studied. Experimental results show that the clad microstructure is composed of primary dendrite and block(or needle) eutectic. The mophology of eutectic carbide is resulted from its chemical composition. Bright ribbon does not exist, and there is finer hypoeutectic microstructure at the interface between overlapping and clad layers. The clad microstructure becomes finer and inhomgeneous with increasing the distance from the interface. The increase of scanning speed results in finer structure, higher micro hardness, and better homogeneity. The solidification process is discussed based on the analyzed model. Some solidification parameters of laser melting bath are also calculated.
Liu Youliang , Shen Jian , Zhang Xinming
2000(2):114-117.
Abstract:在Gleeble2000热模拟机上对一种2019Al-Li合金进行高温扭转试验,研究了合金扭转时的等效应力-应变关系和扭转变形组织特征,研究结果表明:合金表现出与压缩变形类似的稳态流变特征,扭转等效应力随变形温度的升高和应变速率的降低而减小;其变形过程属于受位错速率机制控制的热激活过程,等效应力、等效应变速率和温度之间基本上满足以曲正弦函数关系,扭转等效应力随变形温度的升高和应变速率的降低而减小。
Zhong Ming , Chen Yuwen , Zhu Zhishou
2000(2):118-120.
Abstract:The influence of solution treatment on the phase transformation and microstructure of the alloy Ti Mo Nb Al is studied. The phase transformation and microstructural characterization of this alloy after different solution treatments are analyzed using optical and transmission electron microscopies(TEM),and X ray diffraction(XRD)technique.
Liu Xianghong , Zhou Lian , Wu Xiaozu , Zhou Nong , Zhang Pingxiang , FengYong
2000(2):121-124.
Abstract:采用高均匀性、低杂质含量的优质Nb46.5Ti(质量分数,下同)合金锭,研究了热处理制度对Nb46.5Ti/Cu多芯超导体临界电流密度的影响。结果表明:较低温度预时效热处理有利于NbTi超导体中α-Ti沉淀相细化,而且分布弥散;时效次数越多,这种效果就越明显。同时时效次数越多,α-Ti沉淀相细化,而且分布弥散;时效次数越多,这种效果就越明显,同时时效次数越多、α-Ti沉淀相数目及密度也越高,从而有
Lu Yonghao , Zhang Yonggang , Qiao Lijie , Wang Yanbin , Chen Changqi , Chu Wuyang
2000(2):128-131.
Abstract:The fracture mechanisms of various lamellar oriented polysynthetically twinned (PST) crystals of Ti 49 at%Al based alloy have been studied using in situ SEM technique. The results indicate that the crack nucleation and propagation strongly depend on the lamellar orientations of PST crystals. The oriented PST crystals possess different fracture mechanisms and morphologies, depending on the lamellar orientation
2000(2):141-143.
Abstract:采用溶胶-凝胶法和热压烧结相结合的新工艺制备超细A12O3p弥散强化铜材料,并对其烧结态和退火态的显微组织和性能进行了观察与分析,结果表明:用这种工艺制和轩的弥散强化铜材料具有高致密度、高强度、高电导率及高温热稳定性等优点;A12O3p颗粒平均尺寸约0.1um,颗粒间距0.3um;900℃退火后性能改变很小。
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