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Enhanced strength of the selective laser melted Al-Mg-Sc-Zr alloy by cold rolling
Materials Science and Engineering: A ( IF 4.081 ) Pub Date : 2020-01-21 , DOI: 10.1016/j.msea.2020.138975
Rulong Ma; Chaoqun Peng; Zhiyong Cai; Richu Wang; Zhaohui Zhou; Xiaogeng Li; Xuanyang Cao

To further refine the coarse columnar grains (CGs) in selective laser melted (SLMed) alloy, an Al-4.0Mg-0.7Sc-0.4Zr-0.5Mn alloy was fabricated by selective laser melting (SLM) and then subjected to cold rolling and annealing at 300 °C for 1 h. Microstructural details and mechanical properties were examined by SEM, EBSD, TEM, and tensile tests. The results show that the microstructure of the SLMed alloy can be further refined by cold rolling. A yield strength of 573 MPa is obtained with an average grain size of 2.4 ± 1.3 μm in the CGs areas, a reduction of approximately 30% compared with the as-fabricated alloy. The enhanced strength of the rolled alloy is derived from the refined grains and high density of Al3(Sc, Zr) phase. Additionally, the Al3(Sc, Zr) particles can enhance the microstructure stability.
更新日期:2020-01-21

 

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