Microstructure evolution within adiabatic shear band in peak aged ZK60 magnesium alloy

被引：54
作者：
Jiang, Lihong [1 ,2 ]
Yang, Yang [1 ,3 ,4 ]
Wang, Zhen [2 ]
Hu, Haibo [2 ]
机构：
[1] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China
[2] Nanchang Hangkong Univ, Sch Aeronaut Mfg Engn, Nanchang 330063, Jiangxi, Peoples R China
[3] Cent S Univ, Key Lab, Minist Educ Nonferrous Met Mat Sci & Engn, Changsha 410083, Peoples R China
[4] China Acad Engn Phys, Inst Fluid Phys, Mianyang 621900, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2018年 / 711卷
基金：
中国国家自然科学基金;
关键词：
Adiabatic shear band; Rotational dynamic recrystallization; Dissolution of the precipitates; ZK60 magnesium alloy; HIGH-STRAIN; DYNAMIC RECRYSTALLIZATION; CARBIDE DISSOLUTION; MOLECULAR-DYNAMICS; HEAT-TREATMENT; LOCALIZATION; DEFORMATION; PRECIPITATION; DISLOCATION; DIFFUSION;
D O I：
10.1016/j.msea.2017.10.111
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Microstructure evolution in adiabatic shear band (ASB) in the peak aged ZK60 magnesium alloy cylindrical tube specimen after explosive radial compression was systematically investigated. High strain rate compression tests were performed by means of the radial collapse of thick-walled cylinder technique to achieve nominal strain rates of about 104 s(-1). The TEM results indicate that the elongated grains and deformed twins are the major characteristics in the boundary of the shear band. The central region in ASB was found to consists of ultrafme and equiaxed grains with a typical size of 100 nm. And it was found that precipitates within ASB were significantly reduced, namely the precipitates instantaneous dissolution during adiabatic shearing. It is proposed that fine equiaxed grains within ASB are the result of rotational dynamic recrystallization during localization. The free energy difference between the precipitates and matrix provided a thermodynamic condition for the dissolution of precipitates. Diffusion rate increased due to high strain rate, high shear stress (large strain) and adiabatic temperature rise, which caused instantaneous dissolution of precipitates.
引用
收藏
页码：317 / 324
页数：8
相关论文
共 49 条
[21]   OBSERVATION OF AN ADIABATIC SHEAR BAND IN TITANIUM BY HIGH-VOLTAGE TRANSMISSION ELECTRON-MICROSCOPY [J].
MEYERS, MA ;
PAK, HR .
ACTA METALLURGICA, 1986, 34 (12) :2493-2499
[22]   Microstructural evolution in adiabatic shear localization in stainless steel [J].
Meyers, MA ;
Xu, YB ;
Xue, Q ;
Pérez-Prado, MT ;
McNelley, TR .
ACTA MATERIALIA, 2003, 51 (05) :1307-1325
[23]   Shear localization in dynamic deformation of materials: microstructural evolution and self-organization [J].
Meyers, MA ;
Nesterenko, VF ;
LaSalvia, JC ;
Xue, Q .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2001, 317 (1-2) :204-225
[24]   Effects of precipitate shape and orientation on dispersion strengthening in magnesium alloys [J].
Nie, JF .
SCRIPTA MATERIALIA, 2003, 48 (08) :1009-1015
[25]   Shear strain localization in AA 2219-T8 aluminum alloy at high strain rates [J].
Owolabi, G. M. ;
Bolling, D. T. ;
Tiamiyu, A. A. ;
Abu, R. ;
Odeshi, A. G. ;
Whitworth, H. A. .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2016, 655 :212-220
[26]   Microstructure of adiabatic shear bands in Ti6Al4V [J].
Peirs, J. ;
Tirry, W. ;
Amin-Ahmadi, B. ;
Coghe, F. ;
Verleysen, P. ;
Rabat, L. ;
Schryvers, D. ;
Degrieck, J. .
MATERIALS CHARACTERIZATION, 2013, 75 :79-92
[27]   ON THE CORE STRUCTURES OF EDGE DISLOCATIONS IN NACL AND MGO - CONSEQUENCES FOR THE CORE CONFIGURATIONS OF DISLOCATION DIPOLES [J].
RABIER, J ;
PULS, MP .
PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, 1989, 59 (04) :821-842
[28]   Adiabatic shear failure and dynamic stored energy of cold work [J].
Rittel, D ;
Wang, ZG ;
Merzer, M .
PHYSICAL REVIEW LETTERS, 2006, 96 (07)
[29]   ENHANCED DIFFUSION DURING PLASTIC DEFORMATION BY MECHANICAL DIFFUSION [J].
RUOFF, AL .
JOURNAL OF APPLIED PHYSICS, 1967, 38 (10) :3999-&
[30]   Molecular dynamics simulation of grain boundary plasticity in magnesium and solid-solution magnesium alloys [J].
Somekawa, Hidetoshi ;
Mukai, Toshiji .
COMPUTATIONAL MATERIALS SCIENCE, 2013, 77 :424-429
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