| 引用本文: | 董学光,王眉眉,韦绍林,邹立颖,贺铭兰,杨阳.3004铝合金晶格和织构演化的原位X射线衍射研究[J].材料科学与工艺,2022,30(2):91-96.DOI:10.11951/j.issn.1005-0299.20210194. |
| DONG Xueguang,WANG Meimei,WEI Shaolin,ZOU Liying,HE Minglan,YANG Yang.In-situ X-ray diffraction studies of lattice and texture evolution of 3004 aluminum alloy[J].Materials Science and Technology,2022,30(2):91-96.DOI:10.11951/j.issn.1005-0299.20210194. |
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| 3004铝合金晶格和织构演化的原位X射线衍射研究 |
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董学光,王眉眉,韦绍林,邹立颖,贺铭兰,杨阳
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(中铝材料应用研究院有限公司,北京 100028)
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| 摘要: |
| 为探究3004铝合金板材在拉伸变形过程中晶粒取向变化和晶格应变行为,明确两者在塑性变形过程中的竞争机制和作用,本文首次将原位拉伸方法用于铝合金织构演化和晶格应变行为的研究中,利用试验装置对3004铝合金进行定量应变拉伸,并在不同变形量下对样品进行X射线衍射物相和织构测试分析。实验结果表明:样品在弹性变形区晶格常数随应变的增加线性减小,3004铝合金样品中6种典型织构总量未发生变化；随着拉伸进入塑性阶段,晶格常数减小的速度减弱并脱离线性,6种典型织构总量开始减弱；当应变继续增加,应力应变曲线产生Portevin-Le Chatelier(PLC)效应呈现锯齿状,此时织构总量百分比达到最小值；从PLC效应结束到样品断裂,晶格常数仍保持非线性减小,但织构总量持续增加。在整个拉伸过程中,样品晶格应变、PLC效应、织构存在的竞争机制可由能量最低原理解释。在弹性变形区,晶格应变起主导作用；在初始塑性变形区和PLC效应区,晶格应变和PLC效应共同主导；在近断裂区,晶格应变持续存在,PLC效应减弱,织构变化占据主导优势。 |
| 关键词: X射线衍射 原位拉伸 铝合金织构 晶格应变 PLC效应 |
| DOI：10.11951/j.issn.1005-0299.20210194 |
| 分类号:TG115.23 |
| 文献标识码:A |
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| In-situ X-ray diffraction studies of lattice and texture evolution of 3004 aluminum alloy |
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DONG Xueguang,WANG Meimei,WEI Shaolin,ZOU Liying,HE Minglan,YANG Yang
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(Chinalco Materials Application Research Institute Co., Ltd., Beijing 100028, China)
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| Abstract: |
| To investigate the grain orientation evolution and lattice strain behavior of 3004 aluminum alloy sheet during tensile deformation and clarify their competition mechanism in the process of plastic deformation,the in-situ tensile test method is applied in this paper to study the texture evolution and lattice strain behavior of aluminum alloys for the first time. Quantitative strain tensile test on 3004 aluminum alloys was performed by means of in-situ tensile instrument, and phase and texture analysis of samples under different deformations were conducted by using X-ray diffraction. Results show that at the elastic deformation stage, the lattice parameter decreased linearly with the increase in strain, and the amount of six typical textures in the sample of 3004 aluminum alloy did not change. As the sample entered the plastic stage, the reduction rate of lattice parameter weakened and departed from linearity,and the total amount of six typical textures began to decrease. When the strain continued to increase, the stress-strain curve exhibited Portevin-Le Chatelier(PLC) effect with serrated shape, and the percentage of total texture reached the minimum. From the end of PLC effect to sample fracture, the lattice parameter still decreased nonlinearly, but the total amount of texture increased continuously. During the overall tensile process, the competition mechanism between the lattice strain, PLC effect, and texture could be explained by the lowest energy principle. At the elastic deformation stage, the lattice strain played a leading role. The lattice strain and PLC effect jointly dominated the initial stage of plastic deformation and PLC effect. At the near fault stage the lattice strain existed persistently,the PLC effect weakened, and the texture evolutione stablished dominance. |
| Key words: X-ray diffraction in-situ tensile test aluminum texture lattice strain PLC effect |
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