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微量Mn对Al-7%Mg合金铸锭组织和力学性能的影响
Effect of Trace Mn on Microstructure and Mechanical Properties of Al-7%Mg Alloy Ingots
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- DOI:
- 作者:
- 李盛锋 李继林 农登 孙小燕 路建宁 刘明阳
LI Shengfeng;LI Jilin;NONG Deng;SUN Xiaoyan;LU Jianning;LIU Mingyang
- 作者单位:
- 广东省材料与加工研究所
Institute of Material and Forming Technology of Guangdong Province, Guangzhou 510651, China
- 关键词:
- MN含量 Al-7%Mg合金 流动性 力学性能 微观组织
Mn content Al-7%Mg alloy fluidity mechanical properties microstructure
- 摘要:
- 采用光学显微镜(OM)、流动性及力学性能测试等分析手段研究了微量的Mn元素对Al-7%Mg合金铸态微观组织、流动性及力学性能的影响。结果表明,微量Mn的添加对Al-7%Mg合金的晶粒细化效果并不明显;但对改善合金力学性能是有益的,随着Mn含量的增加,Al-7%Mg合金流动性先增加后降低,当添加0.15%Mn时,合金的单向流动性能最好,平均流动长度达到900 mm;Mn含量在0.05%~0.25%内变动时,合金的抗拉强度、屈服强度和伸长率均随着Mn的增加而显著提高,添加0.25%Mn时分别为299 MPa、151 MPa和12.6%。The effects of trace Mn on the as-cast microstructure, fluidity and mechanical properties of Al-7%Mg alloy were investigated by means of optical microscopy (OM), fluidity and mechanical properties test. The results show that the addition of trace Mn has no obvious grain refining effect on Al-7%Mg alloy;but, it is beneficial to improve the mechanical properties of the alloy. With the increase of Mn content, the fluidity of Al-7%Mg alloy increases first and then decreases. When 0.15% Mn is added, the unidirectional popularity of the alloy is the best, and the average flow length reaches 900 mm. When the Mn content fluctuated within 0.05%~0.25%, the tensile strength, yield strength and elongation of the alloy increased significantly with the increase of Mn. When adding 0.25% Mn, they were 299 MPa, 151 MPa and 12.6% respectively.