Portevin-Le Chatelier effect, twinning-detwinning and disordering in an aged Ni-Cr-Mo alloy during large plastic deformation

被引：11
|
作者：
He, Wanjun [1 ]
Hu, Rui [1 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2021年 / 803卷
基金：
中国国家自然科学基金;
关键词：
Pt2Mo-type LRO phase; Portevin-Le Chatelier effect; Disordering; Detwinning; Partial dislocation; WROUGHT MAGNESIUM ALLOY; MECHANICAL-PROPERTIES; PT2MO-TYPE STRUCTURE; SERRATED FLOW; ORDERED PHASE; HIGH-STRENGTH; DISLOCATION; BEHAVIOR; STRAIN; AL;
D O I：
10.1016/j.msea.2020.140506
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Portevin-Le Chatelier (PLC) effects, twinning-detwinning and disordering phenomena in long-range ordered (LRO) phase strengthened Ni-Cr-Mo alloys during hot compression are reported and investigated. The results reveal that the PLC effects with type-C serrations occur in the solution-treated and aged alloys, and that the Pt2Mo-type LRO phase can increase the serration amplitude at the early stage of deformation. Only after the early stage of deformation, the twinning of aged alloy can be activated. However, the deformation twin and the Pt2Mo-type LRO phase are not stable during the severe deformation. The potential disordering process of the LRO phase is provided as the slipping of the dislocation on the two valid {111}< 110 > slip systems. The occurrence of the steps on the twin boundaries of the remanent deformation twins reveals that the detwinning mechanism is likely the dislocation-twin boundary interaction.
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页数：9
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