丁春慧,李萍,丁永根,等.基于高压扭转工艺的Al-Zn-Mg-Cu合金强韧化机理研究[J].精密成形工程,2018,10(4):126-131.
DING Chun-hui,LI Ping,DING Yong-gen,et al.Strengthening and Toughening Mechanism of Al-Zn-Mg-Cu Alloy Based on High Pressure Torsion[J].Journal of Netshape Forming Engineering,2018,10(4):126-131. |
| 基于高压扭转工艺的Al-Zn-Mg-Cu合金强韧化机理研究 |
| Strengthening and Toughening Mechanism of Al-Zn-Mg-Cu Alloy Based on High Pressure Torsion |
| 投稿时间：2018-04-02 修订日期：2018-07-10 |
| DOI：10.3969/j.issn.1674-6457.2018.04.020 |
| 中文关键词: Al-Zn-Mg-Cu 高压扭转 显微组织 力学性能 |
| 英文关键词: Al-Zn-Mg-Cu high pressure torsion microstructure mechanical properties |
| 基金项目:国家自然科学基金（51575153） |
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| 摘要点击次数: 4281 |
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| 中文摘要: |
| 目的 研究轧态Al-Zn-Mg-Cu合金在高压扭转变形中组织性能的演变规律。方法 在120 ℃下，对Al-Zn-Mg-Cu合金进行扭转1, 5, 10圈的高压扭转实验，采用X射线衍射、光学显微镜、扫描电镜和拉伸实验对Al-Zn-Mg-Cu合金在高压扭转变形过程中组织及力学性能进行分析。结果 在高压扭转变形中，合金中晶粒显著细化。随着扭转圈数的增加，晶粒达到亚微米级，沿着高压扭转的方向分布。同时，合金中第二相含量减少，间距增大。合金的最强衍射峰由(220)转变为(111)，呈现{111}<110>择优取向，位错密度随着扭转圈数的增加而增加。合金的强度和伸长率随着扭转圈数的增加而增加，扭转至10圈后，合金的强度提高了16.87%，伸长率从8.67%提升到10.65%。结论 高压扭转变形细化了合金的晶粒，提高合金强度的同时改善了合金的塑性。 |
| 英文摘要: |
| The paper aims to study evolution of microstructure and properties of rolled Al-Zn-Mg-Cu alloy deformed by high pressure torsion. High pressure torsion under 1, 5 and 10 turns of Al-Zn-Mg-Cu alloy was carried out at 120 ℃, the microstructure and mechanical properties of Al-Zn-Mg-Cu alloy during high pressure torsion were analyzed by X-ray diffraction, optical microscope, scanning electron microscope and tensile test. During high pressure torsion, the grain of the alloy was significantly refined. The grain reached the submicron level and distributed along the direction of high pressure torsion with the increase of turns. At the same time, the content of the secondary phase of the alloy was reduced and the spacing was increased. The strongest diffraction peak of the alloy was converted from (220) to (111), showing a preferred orientation of {111} <110>, the dislocation density increased with the number of turns. The strength and elongation of the alloy increased with the increase of turn, the strength of the alloy increased to 16.87%, and the elongation increased from 8.67% to 10.65% after 10 turns. High pressure torsion refines the grain of the alloy, improves the strength and plasticity of the alloy. |
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