The effects of grain size on the hot deformation and processing map for 7075 aluminum alloy

被引：114
作者：
Yang, Yongbiao [1 ]
Zhang, Zhimin [1 ]
Li, Xubin [1 ]
Wang, Qiang [1 ]
Zhang, Yanhui [2 ]
机构：
[1] North Univ China, Coll Mat Sci & Engn, Taiyuan 030051, Peoples R China
[2] TWI, Cambridge CB21 6AL, England
来源：
MATERIALS & DESIGN | 2013年 / 51卷
关键词：
Aluminum alloy; Flow stress; Processing map; Dynamic recovery; Dynamic recrystallization; Grain size; INITIAL MICROSTRUCTURE; BEHAVIOR; WORKING; COMPRESSION;
D O I：
10.1016/j.matdes.2013.04.034
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effects of grain size on hot deformation and processing map of 7075 aluminum alloy were investigated using Gleeble-1500 test machine at 320-480 degrees C with strain rates from 0.001 to 1 s(-1). The microstructural evolution observations of the alloy were carried out using ZESIS optical microscopy. The results showed that the flow stress increased with increasing strain rate and decreasing temperature. The flow stress of the alloy with coarse grains was higher than that of the alloy with fine grains. During hot-deformation, the alloy exhibited dynamic recovery at temperatures ranging from 320 to 440 degrees C and dynamic recrystallization at 480 degrees C. The processing maps for the alloy with different grain sizes were built at a strain of 0.6. It was found that the characteristics of the two processing maps were different. The instability deformation domain occurred at temperatures between 320 and 340 degrees C and at a strain rate of 0.18-1 s(-1) for the alloy with coarse grains, but at temperatures between 380 and 420 degrees C and also at a strain rate of 0.18-1 s(-1) for the alloy with fine grains. Based on the processing maps and microstructure observations, the optimum hot-working parameters were determined to be 480 degrees C at 0.1 s(-1) for the coarse alloy and 480 degrees C at 0.01 s(-1) for the fine alloy. The optimized hot working parameters of 7075 aluminum alloy with different grain size could be used in various hot working processes. (c) 2013 Elsevier Ltd. All rights reserved.
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页码：592 / 597
页数：6
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