| 轻质Al-Mg-Li合金的微观组织与力学性能 |
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| 引用本文： | 罗海云,邝泉波,王日初.轻质Al-Mg-Li合金的微观组织与力学性能[J].有色金属科学与工程,2019,10(4):66-71. |
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| 作者姓名： | 罗海云 邝泉波 王日初 |
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| 作者单位： | 西南铝业(集团)有限责任公司,重庆,401326;中南大学材料科学与工程学院,长沙,410083 |
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| 基金项目： | 国家重点研发计划资助项目2016YFB0300802 |
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| 摘 要： | 采用熔炼和热挤压制备轻质Al-5.5Mg-2.0Li-0.1Zr-0.2Sc合金，利用X射线衍射仪、差示扫描量热仪、金相显微镜、扫描电子显微镜、显微硬度计及拉伸试验机对合金的物相组成、微观组织、力学性能及断口形貌进行检测分析，研究时效工艺温度（120 ℃和160 ℃）对合金微观组织和力学性能的影响.结果表明:Al-Mg-Li合金挤压后晶粒组织呈纤维状，存在一定数量的Al3Li（δ′）和Al2MgLi（S）相；经固溶和时效处理后，再结晶晶粒尺寸变大，主要析出相为δ′相S相；160 ℃时效处理容易加速时效析出行为，导致析出相粗化，强化效果减弱；经120 ℃/20 h峰时效处理后，合金的抗拉强度、屈服强度和延伸率分别达到532 MPa、475 MPa和4.4 %.
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| 关 键 词： | 热挤压 Al-Mg-Li合金 微观组织 力学性能 |
| 收稿时间： | 2019-05-31 |
Microstructure and mechanical properties of spray deposited Al-Mg-Li Alloy |
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| Affiliation: | 1.Southwest Aluminium (Group) Co., Ltd., Chongqing 401326, China2.School of Materials Science and Engineering, Central South University, Changsha 410083, China |
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| Abstract: | The Al-5.5Mg-2.0Li-0.1Zr-0.2Sc alloy was produced by casting and hot extrusion process. The phase composition, microstructure, fracture morphology and mechanical properties of the alloy were analyzed by X-ray diffraction, differential scanning calorimeter, metallographic microscope, scanning electron microscopy, microhardness tester and tensile testing machine. And the effects of aging temperature (120 ℃ and 160 ℃) on the microstructure and mechanical properties of the alloy were studied. The results show that, the microstructure of as-extruded Al-Mg-Li alloys is fibrous-like. After solid solution and aging, reinforcement phase of δ′ (Al3Li) and S1 (Al2MgLi) precipitate from alloy after aging. The alloy reaches peak aging state after aging at 120 ℃/20 h, and the tensile strength, yield strength and elongation a 532 MPa, 476 MPa and 4.4 %, respectively. |
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