| 6005A与6082铝合金热变形流变行为 |
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| 引用本文： | 丁贤飞, 张利欣, 孙冬柏, 王志海, 王立臣, 李恒奎. 6005A与6082铝合金热变形流变行为[J]. 工程科学学报, 2012, 34(9): 1041-1047. DOI: 10.13374/j.issn1001-053x.2012.09.008 |
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| 作者姓名： | 丁贤飞 张利欣 孙冬柏 王志海 王立臣 李恒奎 |
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| 作者单位： | 1. 北京科技大学国家材料服役安全科学中心, 北京 100083; |
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| 摘 要： | 利用Gleeble-1500热模拟试验机对6005A和6082铝合金进行高温等温压缩试验,研究了在变形温度为450~550℃和应变速率为0.005~10 s-1条件下两种铝合金的热变形流变行为.6005A铝合金在低应变速率条件下,不同变形温度时的流变曲线均呈现波浪形特征,随着应变速率的增加,硬化和软化接近平衡,表现为稳态流变特征;在高应变速率条件下,硬化过程占据主导地位,回复和硬化过程的竞争使流变曲线呈现波浪形上升的趋势.6082铝合金在低应变速率情况下,不同变形温度时的流变曲线未出现周期性波动;在中等应变速率条件下也表现为稳态流变特征;在高应变速率条件下出现波浪形特征.两种铝合金均为正应变速率敏感材料,其热变形是受热激活控制.最后给出了铝合金热变形条件下流变应力、应变速率和变形温度三者之间的关系式.
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| 关 键 词： | 铝合金 压缩试验 高温试验 流变应力 应变速率 |
| 收稿时间： | 2012-04-11 |
Flow behaviors of 6005A and 6082 aluminum alloys during hot deformation |
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| DING Xian-fei, ZHANG Li-xin, SUN Dong-bo, WANG Zhi-hai, WANG Li-chen, LI Heng-kui. Flow behaviors of 6005A and 6082 aluminum alloys during hot deformation[J]. Chinese Journal of Engineering, 2012, 34(9): 1041-1047. DOI: 10.13374/j.issn1001-053x.2012.09.008 |
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| Authors: | DING Xian-fei ZHANG Li-xin SUN Dong-bo WANG Zhi-hai WANG Li-chen LI Heng-kui |
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| Affiliation: | 1. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China;2. Tangshan Railway Vehicle Co. Ltd., Tangshan 063035, China;3. Jilin Midas Aluminum Industries Co. Ltd., Liaoyuan 136200, China;4. CRS Qingdao Sifang Co. Ltd., Qingdao 266611, China |
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| Abstract: | The flow behaviors of 6005A and 6082 aluminum alloys were investigated by high-temperature isothermal compression on a Glebble-1500 thermal-mechanical simulator at deformation temperatures of 450 to 550℃ and strain rates of 0.005 to 10 s-1. The flow stress curve of 6005A aluminum alloy exhibits a waveform character at different deformation temperatures under the condition of low strain rate. With increasing strain rate the competition between softening and hardening closely reaches to a balance so that the flow stress appears as a steady state. At high strain rate, the hardening is dominant during the hot deformation and there is a waveform increase in the flow stress curve because of the competition between reverting and hardening. The flow stress curve of 6082 aluminum alloy, however, does not show the waveform character at low strain rate. A steady-state stress is also displayed at medium strain rate. But the waveform flow curve is shown at high strain rate. Both of the alloys are positive strain rate sensitive materials and their hot deformation is controlled by the thermal activation. Finally the relationships among flow stress, strain rate and deformation temperature were proposed for 6005A and 6082 aluminum alloys, respectively. |
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| Keywords: | aluminum alloys compression testing high temperature testing flow stress strain rate |
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