Constitutive Equation and Hot Compression Deformation Behavior of Homogenized Al-7.5Zn-1.5Mg-0.2Cu-0.2Zr Alloy

被引：19
作者：
He, Jianliang [1 ]
Zhang, Datong [1 ]
Zhang, Weiweng [1 ]
Qiu, Cheng [1 ]
Zhang, Wen [1 ]
机构：
[1] South China Univ Technol, Natl Engn Res Ctr Near Net Shape Forming Metall M, Guangzhou 510640, Guangdong, Peoples R China
来源：
MATERIALS | 2017年 / 10卷 / 10期
关键词：
aluminum alloy; hot compression; constitutive equation; microstructure; TEMPERATURE FLOW BEHAVIOR; A356; ALUMINUM-ALLOY; ELEVATED-TEMPERATURE; MICROSTRUCTURAL EVOLUTION; PROCESSING MAPS; STAINLESS-STEEL; STRAIN; PREDICT; STRESS;
D O I：
10.3390/ma10101193
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The deformation behavior of homogenized Al-7.5Zn-1.5Mg-0.2Cu-0.2Zr alloy has been studied by a set of isothermal hot compression tests, which were carried out over the temperature ranging from 350 degrees C to 450 degrees C and the strain rate ranging from 0.001 s(-1) to 10 s(-1) on Gleeble-3500 thermal simulation machine. The associated microstructure was studied using electron back scattered diffraction (EBSD) and transmission electron microscopy (TEM). The results showed that the flow stress is sensitive to strain rate and deformation temperature. The shape of true stress-strain curves obtained at a low strain rate (0.1 s(-1)) conditions shows the characteristic of dynamic recrystallization (DRX). Two Arrhenius-typed constitutive equation without and with strain compensation were established based on the true stress-strain curves. Constitutive equation with strain compensation has more precise predictability. The main softening mechanism of the studied alloy is dynamic recovery (DRV) accompanied with DRX, particularly at deformation conditions, with low Zener-Holloman parameters.
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页数：12
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