王宇
,
周玉美
,
纪元超
,
任晓兵
中国材料进展
doi:10.7502/j.issn.1674-3962.2016.06.01
应变玻璃是形状记忆合金材料体系中发现的短程有序晶格应变区域（纳米应变畴）的冻结态。它的宏观物理性质具有典型的玻璃化转变特征，如动态冻结特性和非各态遍历性；在微观结构上表现为母相基体中形成了许多随机分布的纳米应变畴，但平均结构不随温度改变。应变玻璃表现出一些独特的相变行为，如应变玻璃的等温马氏体相变、应变玻璃的应力诱发马氏体相变等。此外，该体系还具有许多功能特性，包括形状记忆效应、超弹性、弹热效应、阻尼效应、力控阻尼效应、Invar和Elinvar效应，因此这类新型金属智能材料具有很强的应用潜质。应变玻璃合金独特的纳米应变畴对温度和外场的响应导致了以上多种功能特性的产生。
关键词:
金属智能材料
,
应变玻璃
,
形状记忆合金
,
马氏体相变
GONG Hai
,
ZHANG Xiumu Department of Materials
,
Dalian Railway Institute
,
Dalian
,
116022 China.Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
110015
,
China.
材料科学技术（英文）
The morphology and substructure of mixed martensites in ferrous alloys have been examined by using optical and transmission electron microscope. The results indicated that the main formation se- quence of martensitic morphology was butterfly→ plate→lath,with decreasing forming temperatures when the plastic accommodation takes place in the parent phase,which is affected by the transforma- tion strain fiélds.It was shown that the martensite morphology is not only decided by the forming temperature alone,but also by the dislocation struc- ture in austenite before the transformation.
关键词:
martensite morphology
,
null
,
null
