Working Conditions of 7B50 Aluminum during Hot Compression Deformation

Long Ping1; Pan Qinglin2; Zhou Jian2; Liu Xiaoyan2; He Yunbin2

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Working Conditions of 7B50 Aluminum during Hot Compression Deformation
Vol. 31, Issue 12, Pages: 1093-1097(2011)
Published： 2011 ，
DOI：

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[1]隆平,潘清林,周坚,刘晓艳,何运斌.7B50铝合金热压缩变形加工条件的研究[J].特种铸造及有色合金,2011,31(12):1093-1097.

Long Ping1, Pan Qinglin2, Zhou Jian2, et al. Working Conditions of 7B50 Aluminum during Hot Compression Deformation. [J]. Special Casting & Nonferrous Alloys 31(12):1093-1097(2011)
[1]隆平,潘清林,周坚,刘晓艳,何运斌.7B50铝合金热压缩变形加工条件的研究[J].特种铸造及有色合金,2011,31(12):1093-1097. DOI：

Long Ping1, Pan Qinglin2, Zhou Jian2, et al. Working Conditions of 7B50 Aluminum during Hot Compression Deformation. [J]. Special Casting & Nonferrous Alloys 31(12):1093-1097(2011) DOI：

摘要

在变形温度为300～460℃

应变速率为0.001～1.000s-1的条件下

采用Gleeble-1500热模拟试验机对7B50铝合金的热变形加工行为进行了研究。结果表明

7B50铝合金在热压缩变形中的流变应力随着温度的升高而减小

随着应变速率的增大而增大。对该合金进行热变形加工的适宜条件是:热压缩加工温度为380～460℃、应变速率为0.100～1.000s-1。在变形温度较高或应变速率较低的合金中发生部分再结晶

并且在合金组织中存在大量的位错和亚晶。随着温度升高和应变速率降低

亚晶尺寸增大

位错密度减小

合金的主要软化机制逐步由动态回复转变为动态再结晶。

Abstract

The flow stress behavior of 7B50 aluminum alloy was investigated at 300 ～ 460 ℃ and strain rates of 0.001～1 s-1 on the Gleeble-1500 thermal simulator.The results show that the flow stress is decreased with increasing in deforming temperature and increased with increasing in strain rate.Deformation temperature of 380～460 ℃ and the strain rate of 0.1～1 s-1 are the acceptable processing parameters.Partial recystallization occurs in the alloys deformed at a high temperature or at a low strain rate

and large number of dislocations and subgrains are observed in the alloy.The subgrain size is increased and the dislocation density is decreased with increasing in temperature and decreasing in strain rate.The main soften mechanism of the alloy is characterized by dynamic recovery to dynamic recrystallization.