Wenge LIU+
,
Min ZHU
,
Dazhi YANG
,
Dept. of Materials Engineering
,
Dalian University of Technology
,
Dalian
,
116024
,
ChinaZhongguang WANG
,
State Key Laboratory for Fatigue and Fracture of Materials
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
11001
材料科学技术（英文）
The thermal-mechanical (T-M) cycles at constant strain of a polycrystalline CuZnAl alloy have been studied in the. present work. In-situ optical microscopic observations have been made to reveal the features of the phase transitions during T-M cycling. The variation of stress-temperature (S-T) curves and electrical resistance-temperature (R-T) curves accompanying with T-M cycling have been measured by tensile test and electrical resistance measurements. It has been found that the polycrystalline CuZnAl alloy shows apparent morphology changes and properties variations in the first cycle during T-M cycling which is called the first cycle effect in the present work. The stable transformation procedure in the T-M cycle is: martensiteparent phase +residual acicular martensite. This residual martensite possesses the character of stress-induced martensite.
关键词:
CuZnAl shape memory alloy
,
null
,
null
金嘉陵
,
徐慈怀
,
邵自昌
金属学报
<正> 合金中的马氏体是晶体点阵切变的产物,对于多晶材料,马氏体通常在各个晶粒中形核长大,但不跨越晶界,然而在Cu-Zn-Al形状记忆合金的研究中,我们观察到了马氏体穿晶界生长现象。记忆合金中的马氏体相变具有热滞后和驱动力小等特点,称为热弹性马氏体相变,马氏体穿晶界生长可能也是这类相变的一个特征。该现象既涉及马氏体相变理论本身,又与晶界问题密切相关,应该成为一个有趣的研究课题。
关键词:
铜锌铝记忆合金
,
martensite
,
transgranular growth
