王建鑫
,
田新衍
材料导报
doi:10.11896/j.issn.1005-023X.2015.10.021
利用变形约束时效的方法制作了双程记忆弹簧,采用DSC和温度-位移记录仪表征了弹簧的相变行为和双程记忆效应.DSC和双程记忆动力学曲线均表明弹簧在升温过程的形状变化由马氏体逆相变M/R→A控制,而冷却过程受A→R→M两阶段相变控制,并且R相变对双程记忆应变量的贡献比马氏体相变的贡献大.与马氏体相变相比,R相变诱发的双程记忆效应具有较窄的动作滞后温度以及很高的记忆稳定性,这与变形约束时效时所获得的一定取向的Ti3Ni4相共格内应力场有关.结果表明:变形约束时效是获得双程记忆弹簧的良好途径,制作方法相对简单,获得的双程记忆应变量大,且稳定性高,尺寸制作具有很强的可设计性以及动作温度的可控性.
关键词:
双程记忆效应
,
NiTi合金弹簧
,
约束时效
,
形状记忆合金
,
马氏体相变
LUO Laizhong ZHANG Jinxiu LIN Guangming Zhongshan University
,
Guangzhou
,
510275
,
China Lecturer
,
Dept.of Physics and Institute of Material Science
,
Zhongshan University
,
Guangzhou
,
510275
,
China
金属学报(英文版)
The snap-action behavior of a Ni-Ti alloy disc which is controlled by combination of a nonlinear stress field and temperature has been studied.After treatment for two-way shape memory,all shape memory strain of snap-action finishes abruptly at a certain temperature within an interval of less than 1 ms.The results of resistance measurement and in-situ X-ray diffraction indicate that the snap-action strain is mainly resulted from the snap-action β (?)R transformation.
关键词:
shape memory alloy
,
null
,
null
LIN Guangming CHENXingyuan ZHANG Jinxiu Material Science Research Institute
,
Zhongshan University
,
Guangzhou
,
China WANG Yurui Metallurgy Research Institute of Beijing Iron and Steel Company
,
Beijing
,
China LIN Guangming Associate Professor
,
Department of Physics
,
Zhongshan University
,
Guangzhou 510275
,
China
金属学报(英文版)
Snap-acting two way shape memory device can be obtained by using the design proposed by authors.Some essential parameters which characterize the properties of device have been pro- posed also in this paper.And the principle and method according to which a practical snap-acting device can be designed have been described.
关键词:
shape memory alloy
,
null
,
null
ZHAO Xu
,
QI Min
,
YANG Dazhi Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
110015
,
China.Department of Materials Engineering
,
Dalian University of Technology
,
Dalian
,
116012
,
China.
材料科学技术（英文）
The effect of α phase on CuZnAl shape memo- ry alloy(SMA)has been systematically studied by electrical resistance method,quantitative measure- ment of micrography and transmission electron microscopy(TEM).It is found that,by controlling the amount of α phase in(α+β)-CuZnAl alloy, phase transformation temperatures can be adjusted precisely in a wide range,while the good shape memory effect of CuZnAl is kept.In a word, quenching from(α+β)dual phase region is a rea- sonable method of adjusting phase transformation temperatures for CuZnAl alloy.
关键词:
(α+β)-CuZnAl alloy
,
null
,
null
