Hardening and softening analysis of pure titanium based on the dislocation density during torsion deformation

被引：23
作者：
Chen, Han [1 ]
Li, Fuguo [1 ]
Li, Jinghui [1 ]
Ma, Xinkai [1 ]
Li, Jiang [1 ]
Wan, Qiong [1 ]
机构：
[1] Northwestern Polytech Univ, Sch Mat Sci & Engn, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2016年 / 671卷
基金：
中国国家自然科学基金;
关键词：
Torsion deformation; Hardening and softening; Taylor dislocation model; Hardness; Slip and twinning; Dislocation density; STRAIN-GRADIENT PLASTICITY; HIGH-PRESSURE TORSION; MICROSTRUCTURE EVOLUTION; ALPHA-TITANIUM; MECHANICAL-PROPERTIES; COMPRESSIVE PROPERTIES; CONVENTIONAL THEORY; IMPROVING TENSILE; MICRO-INDENTATION; ALLOY PLATES;
D O I：
10.1016/j.msea.2016.06.046
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The hardening and softening phenomena during torsion deformation are studied based on the Taylor dislocation model for pure titanium. The hardening and softening phenomena are observed through the hardness analysis during micro-indentation test and micro-hardness test. Besides, the variations of indentation size also verify the existence of hardening and softening phenomena during torsion. The variations of geometric necessary dislocations (GNDs) and statistic store dislocations (SSDs) state that the positions of high dislocation density and low dislocation density correspond to the positions of hardening and softening. The results from the microstructure, grain boundaries evolution and twins analysis indicate the twins play an important role in appearance of hardening and softening phenomena. The appearance of hardening and softening phenomena are attributed to the combination of different slip systems and twinning systems combining with the Schmid Factor (SF) analysis and the transmission electron microscope (TEM). The appearance of hardening and softening phenomena can be explained by the Taylor dislocation theory based on TEM analysis. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：17 / 31
页数：15
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