Modification of the Recovery Behavior of TiNi Shape Memory Alloy(SMA)by Chemical Heat Treatment

作     者：WANGGao-chao YANGGang HUANGYi-bin MINSi-lin WANG Gao-chao, YANG Gang, HUANG Yi-bin, MIN Si-lin College of Materials Science and Engineering, Nanchang Institute of Aeronautical Technology,Nanchang, China

作者机构：CollegeofMaterialsScienceandEngineeringNanchangInstituteofAeronauticalTechnologyNanchangChina 

出 版 物：《材料热处理学报》 (Transactions of Materials and Heat Treatment)

年 卷 期：2004年第25卷第5期

页      面：122-125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：supports from Jiangxi Provincial Natural Science Fund(CA200201002) 

主　　题：TiNi形状记忆合金 化学热处理 钐 线性反转 

摘      要：In order to improve the linear recovery behavior, TiNi shape memory alloy springs were samariumed at 550°C for 4 hours with SmH3 as samarium source, in a vacuum furnace. The phase of samariumed layer was determined by X-ray diffractometer (XRD). The fracture surface of TiNi SMA spring was investigated by scanning electronic microscope (SEM). The experimental results indicate that a thick samariumed layer composed of NiSm intermetallics existed on the fracture surface. Additionally, a new idea of linear recovery behavior in shape memory alloy (SMA) has been proposed, and its properties have been defined. The reversion measurements show that the linear recovery properties of TiNi SMA were obviously improved. The temperature range of the linear reversion (Tw) was enlarged from 4°C to 8’C, The ratio of linear reversion was increased from 54% to 75%, the proportion of linear reversion (PL) was increased from 56% to 70%, and the proportion of non-linear reversion (Ps) was decreased from 44% to 10%, but the proportion of total reversion (PT) has a little decrease. These results were attributed to the strengthening effect of NiSm intermetallics.