Structural and Hardness Evolution of Pure Magnesium Subjected to High Pressure Torsion

被引：1
作者：
Gu Ji [1 ]
Yang Xiaohui [1 ]
Ni Song [1 ]
Song Min [1 ]
机构：
[1] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China
来源：
RARE METAL MATERIALS AND ENGINEERING | 2018年 / 47卷 / 05期
基金：
中国国家自然科学基金;
关键词：
Mg; high pressure torsion; hardness; grain refinement; dislocation; SEVERE PLASTIC-DEFORMATION; STACKING-FAULT ENERGY; ULTRAFINE-GRAINED MATERIALS; MICROSTRUCTURAL EVOLUTION; STAGE-V; HOMOGENEITY; METALS; BEHAVIOR; SIZE; TEMPERATURE;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Pure Mg was subjected to high-pressure torsion (HPT) at room temperature, and the structural and hardness evolutions were studied. In addition, the grain size evolution during the hardness steady state was investigated. The results indicate that the hardness HV initially increases with increasing the equivalent strain, reaches a maximum value of similar to 530 MPa, and then decreases to a steady-state level at large strains. However, although the hardness reaches the steady state, the average grain size does not reach a steady state. The evolution of the grain size is different from that the hardness during HPT processing. The continuously decreased grain size during harness steady state may be caused by the annihilation of the dislocations during dynamic recovery or dynamic recrystallization which is resulted from the temperature rising during the continuous HPT processing and the low melting temperature of Mg.
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收藏
页码：1347 / 1351
页数：5
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