摘要
动态再结晶是金属材料改变组织状态的一种重要方式。综述了典型金属材料在高温塑性变形中的3种动态再结晶机制,即不连续动态再结晶、连续动态再结晶和几何动态再结晶。描述了不同再结晶机制的组织特征,包括晶界取向分布、晶内取向积累方式、动态再结晶晶粒尺寸及其与流变应力的关系。基于Ti-24Ni-4Zr-8Sn和Ti-25Nb-3Zr-3Mo-2Sn钛合金的热变形组织演变的研究,提出除了材料本质性能决定了高温塑性变形的再结晶机制外,温度、应变速率、应变量及变形方式等的不同配合可以导致多种再结晶机制发生。
Dynamic recrystallization is considered as an important process for microstructure optimization of metallic materials.In this paper,three different mechanisms of dynamic recrystallization(DRX),including discontinuous DRX(DDRX),continuous DRX(CDRX)and geometric DRX(GDRX),are summarized by illustrating typical metallic materials.Microstructure characteristics,including misorientation distributions,misorientation accumulation patterns,grain size and its relationship to flow stress,are described in detail.Based on the microstructure evolution of two types of titanium alloys,Ti-24Ni-4Zr-8Sn alloy and Ti-25Nb-3Zr-3Mo-2Sn,the author suggest that,besides the essential properties playing a decisive role in DRX mechanism and microstructure evolution,the special deformation condition namely a certain matching of temperature,strain rate and strain,also result in multiple dynamic recrystallizations.
作者
田宇兴
刘成
曹海龙
林海涛
王正安
Tian Yuxing;Liu Cheng;Cao Hailong;Lin Haitao;Wang Zheng’an(Chinalco Material Applications Research Institute Co.Ltd,Beijing 102209,China;Southwest Aluminum(Group)Co,Ltd,Chongqing 402326,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2019年第11期3764-3769,共6页
Rare Metal Materials and Engineering
基金
北京市优秀人才培养资助(2017000102592G091)
中国铝业集团科技基金(HX1716)
关键词
动态再结晶
高温变形
组织
取向
晶粒尺寸
dynamic recrystallization
thermal mechanical deformation
microstructure
misorientation
grain size
