机械合金化+热压制备Laves相TaCr_2合金的物相演变及热力学分析  

Phase Evolution and Thermodynamic Analysis of Laves Phase TaCr_2 Alloy Prepared by Mechanical Alloying Followed by Hot Pressing

作　　者：姚敬[1] 鲁世强[1,2] 肖璇[2] 邓莉萍[1] YAO Jing;LU Shi-qiang;XIAO Xuan;DENG Li-ping(College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,Jiangsu,China;School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330063,Jiangxi,China)

机构地区：[1]南京航空航天大学材料科学与技术学院,江苏南京210016 [2]南昌航空大学航空制造工程学院,江西南昌330063

出　　处：《矿冶工程》2018年第2期110-113,共4页Mining and Metallurgical Engineering

基　　金：国家自然科学基金(51161020);江西省自然科学基金(20114BAB216012)

摘　　要：采用Miedema模型研究了机械合金化(MA)+热压(HP)过程中Cr-33.3%Ta元素粉无序化、非晶化和有序化过程,结果表明,Cr-33.3%Ta物相演变过程中形成Laves相Ta Cr_2最稳定,其次是Ta(Cr)和Cr(Ta)固溶体,非晶态不稳定,形成过程伴随吸热。借助X射线衍射分析了MA和HP过程中Cr-33.3%Ta元素粉的物相演变,结果表明,MA+HP制备Laves相Ta Cr_2合金的过程中,Cr-33.3%Ta元素粉的物相演变为:Ta+Cr元素粉→无序Ta(Cr)和Cr(Ta)固溶体→非晶态→有序金属间化合物Laves相Ta Cr_2。Miedema模型计算结果与试验结果相符。The process of disordering,non-crystallizing and ordering of Cr-33.3%Ta elemental powder in the course of mechanically alloying（MA）and hot pressing（HP）was investigated by using Miedema model.Results showed that Laves-phase TaCr2formed during the phase evolution of Cr-33.3%Ta was more thermodynamically stable than Ta（Cr）and Cr（Ta）solid solution,which were instable in amorphous state,with heat adsorption during the formation.The phase evolution of the Cr-33.3%Ta elemental powder during MA and HP was analyzed by X-ray diffraction.Results indicated that the process of the phase evolution was as follows：Ta＋Cr elemental powder→disordered Ta（Cr）and Cr（Ta）solid solution→amorphous state→ordered intermetallic compound Laves-phase TaCr2.The calculation result of Miedema model is consistent with the test result.

关 键 词：金属间化合物 铬化物 热力学 LAVES相 TaCr2 机械合金化 热压 MIEDEMA模型 

分 类 号：TF125[冶金工程—粉末冶金]