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Diffusive transformation at high strain rate: On instantaneous dissolution of precipitates in aluminum alloy during adiabatic shear deformation

Published online by Cambridge University Press:  19 April 2016

Yang Yang ,
Shuhong Luo ,
Haibo Hu ,
Tiegang Tang  and
Qingming Zhang
Yang Yang*
Affiliation:
School of Material Science and Engineering, Central South University, Changsha, 410083, China; Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, 621900, China; State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, China; Key Laboratory of Ministry of Education for Nonferrous Metal Materials Science and Engineering, Central South University, Changsha, 410083, China
Shuhong Luo
Affiliation:
School of Material Science and Engineering, Central South University, Changsha, 410083, China
Haibo Hu
Affiliation:
Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, 621900, China
Tiegang Tang
Affiliation:
Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, 621900, China
Qingming Zhang
Affiliation:
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Dynamic loading of the hat-shaped specimen of 2195-T6 aluminum lithium alloy was carried out with a split Hopkinson pressure bar at ambient temperature. The formation and evolution mechanisms of adiabatic shear band (ASB) in this alloy were investigated and then microstructure was further observed. The microstructure within ASB in 2195 aluminum alloy was characterized by means of optical microscopy and transmission electron microscopy. The width of ASB was about 20–30 um. Nano-grains (50–100 nm) were observed in the middle of shear zone. Experimental results show that the diffusive transformation took place within ASB during high strain rate deformation, namely the precipitates dissolving in the matrix in the process (within about 71 µs). Based on thermodynamics and kinetics analyses, dissolution of precipitates was firstly investigated during adiabatic shearing deformation, and a dissolution model was suggested in the present work. The diffusive transformation and the microstructure evolution within ASB in 2195 alloy were explained.

Keywords

adiabatic shearing deformationinstantaneous dissolution of precipitatesdiffusive transformation2195 aluminum alloy
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 9 , 14 May 2016 , pp. 1220 - 1228
Copyright
Copyright © Materials Research Society 2016 

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