| T6态7075铝合金温热下各向异性研究 |
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| 引用本文： | 周国伟,李大永,彭颖红. T6态7075铝合金温热下各向异性研究[J]. 金属成形工艺, 2011, 0(6): 9-12 |
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| 作者姓名： | 周国伟 李大永 彭颖红 |
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| 作者单位： | [1]机械系统与振动国家重点实验室,上海200240 [2]上海交通大学机械与动力工程学院,上海200240 |
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| 摘 要： | 对高强度铝合金7075-T6在0.03s-1应变率下,50～250℃温度范围进行系列单向拉伸试验,并测得不同温度下的厚向异性系数R。结果表明：7075-T6铝合金的流动应力随试验温度的升高而减小;在50～200℃温度区间,延伸率随温度的升高而增加;当温度为250℃时,由于T6特性的消失,延伸率反有所降低,得到最佳的成形温度在200℃左右;并且通过对3种不同屈服函数Mises,Hill48和Barlat89比较,得到能准确方便描述7075-T6各向异性的屈服函数,确定了不同温度下屈服函数的参数。
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| 关 键 词： | 7075铝合金 温热成形 单向拉伸 厚向异性系数 屈服函数 |
The Anisotropic Property of 7075-T6 Aluminum Alloy under Warm Condition |
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| ZHOU Guo-wei,LI Da-yong,PENG Ying-hong. The Anisotropic Property of 7075-T6 Aluminum Alloy under Warm Condition[J]. Metal Forming Technology, 2011, 0(6): 9-12 |
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| Authors: | ZHOU Guo-wei LI Da-yong PENG Ying-hong |
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| Affiliation: | 1. State Key Laboratory of Mechanical System and Vibration, Shanghai 200240, China; 2. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China) |
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| Abstract: | Uniaxial tensile tests of high strength aluminum alloy 7075 T6 are carried out at a range of temperatures（50- 250℃ ） and strain rate 0.03 s-1. It is shown that the flow stress of 7075 T6 decreases as the temperature increases. The total elongation increases with the temperature increasing when it is between 50℃ and 200℃. The total elongation at 250 ℃ decreases because of the loss of T6 heat treatment and the optimum forming temperature for 7075-T6 is about 200 ℃. A suitable yield function is chosen through the comparison of three different functions： Mises, Hi1148 and Barlat89, and the parameters of different temperatures are calculated. |
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| Keywords: | 7075 Al alloy warm forming uniaxial tensile plastic anisotropy parameter yield function |
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