She Xinwei, Jiang Xianquan, Qi Bao, Chen Kang
School of Materials and Energy, Southwest University, Tiansheng Road 2, Beibei District, Chongqing 400715, China.
Advanced Materials Research Center, Chongqing Academy of Science and Technology, Yangliu Road 2, Chongqing 401123, China.
Materials (Basel). 2020 Jan 24;13(3):568. doi: 10.3390/ma13030568.
The effect of Er on microstructure and mechanical properties of the 5052 aluminum alloy with a big width-to-thickness ratio was investigated by a metallurgical microscope, scanning electron microscope and tensile testing machine. The results showed that the precipitates were slightly refined after Er addition and AlFe was transformed into AlFe and AlEr with/without a small amount of Fe or Si. The effect of Er on grain refinement was related to its content. When Er content was lower or higher than 0.4%, the grain would coarsen. Homogenization could refine the grain by controlling Er content and distribution in the Al matrix. Long time homogenization at high temperature would significantly reduce the strength of the 5052 aluminum alloy and 5052 aluminum alloys with low Er content, but help to improve the plasticity of those with high Er content. The ultimate tensile strength, yield strength and elongation of the as-cast 5052 aluminum alloy were 197 MPa, 117 MPa and 22.5% respectively. The strength was the highest, when Er content was 0.4 wt. % and the elongation was the best at 0.1 wt. % Er content.
采用金相显微镜、扫描电子显微镜和拉伸试验机研究了铒（Er）对大宽厚比5052铝合金组织和力学性能的影响。结果表明，添加Er后析出相略有细化，AlFe转变为AlFe和AlEr，伴有少量Fe或Si。Er对晶粒细化的影响与其含量有关。当Er含量低于或高于0.4%时，晶粒会粗化。均匀化可通过控制Er在Al基体中的含量和分布来细化晶粒。长时间高温均匀化会显著降低5052铝合金及低Er含量5052铝合金的强度，但有助于提高高Er含量铝合金的塑性。铸态5052铝合金的抗拉强度、屈服强度和伸长率分别为197MPa、117MPa和22.5%。当Er含量为0.4wt.%时强度最高，当Er含量为0.1wt.%时伸长率最佳。
