Effect of annealing temperature on martensitic transformation of Ti_(49.2)Ni_(50.8) alloy processed by equal channel angular pressing

作     者：张殿涛 郭宝 佟运祥 田兵 李莉 郑玉峰 Dmitry-V GUNDEROV Ruslan-Z VALIEV Dian-tao ZHANG;Bao GUO;Yun-xiang TONG;Bing TIAN;Li LI;Yu-feng ZHENG;Dmitry-V GUNDEROV;Ruslan-Z VALIEV

作者机构：哈尔滨工程大学超轻材料与表面技术教育部重点实验室哈尔滨150001 哈尔滨工程大学材料科学与化学工程学院生物医学材料与工程研究中心哈尔滨150001 北京大学工学院材料科学与工程系北京100871 Institute of Physics of Advanced MaterialsUfa State Aviation Technical University 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2016年第26卷第2期

页      面：448-455页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：Project(51001035)supported by the National Natural Science Foundation of China Project(LBH-Q14035)supported by the Postdoctoral Funds for Scientific Research Initiation of Heilongjiang Province,China Project(HEUCF20151002)supported by the Fundamental Research Funds for the Central Universities,China 

主　　题：YiNi alloy equal channel angular pressing martensitic transformation annealing temperature 

摘      要：The effect of annealing temperature on the martensitic transformation of a Ti49.2Ni50.8 alloy processed by equal channel angular pressing （ECAP） was investigated by X-ray diffraction （XRD）, transmission electron microscopy （TEM） and differential scanning calorimetry （DSC）. The as-ECAP processed and subsequently annealed Ti49.2Ni50.8 alloys consist of B2 parent phase, Ti4Ni2O phase and B19′ martensite at room temperature. Upon cooling, all samples show B2→R→B19′ two-stage transformation. Upon heating, when the annealing temperature is less than 400℃, the samples show B19′→R→B2 two-stage transformation; when the annealing temperature is higher than 500 ℃, the samples show B19′→B2 single-stage transformation. The B2-R transformation is characterized by wide interval due to the dislocations introduced during ECAP.