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A detailed microstructural and corrosion analysis of magnesium alloy WE43 manufactured by selective laser melting
Additive Manufacturing ( IF 11.0 ) Pub Date : 2020-05-23 , DOI: 10.1016/j.addma.2020.101321
M. Esmaily , Z. Zeng , A.N. Mortazavi , A. Gullino , S. Choudhary , T. Derra , F. Benn , F. D'Elia , M. Müther , S. Thomas , A. Huang , A. Allanore , A. Kopp , N. Birbilis

The production of magnesium alloy WE43 was achieved by selective laser melting (SLM). The alloy was investigated after SLM, hot isostatic pressing (HIP), and solutionising heat treatment. The microstructure and corrosion behaviour of the specimens were carefully characterised, whilst assessed and contrast relative to the conventionally cast alloy counterpart. The SLM prepared specimens possess a unique microstructure comprising fine grains growing with a strong [0001] texture along the building direction with a low fraction of process-induced and metallurgical defects, reaching < 0.1 %, after optimising the SLM parameters and the HIP treatment. Electrochemical measurements demonstrated that the SLM prepared WE43 is cathodically more active as compared with its cast counterpart. It is proposed that this behaviour is due to a high density of zirconium-rich oxide particles uniformly distributed throughout the alloy microstructure as well as the alterations in the chemical composition of the solid-solution matrix originating from the high cooling rates of SLM. It was also noted that the oxide particles are mainly sourced by powder. The present results suggest that the corrosion of SLM prepared Mg alloys could be greatly improved once the influence of powder characteristics is further understood and controlled.



中文翻译:

选择性激光熔化制备镁合金WE43的详细组织和腐蚀分析

镁合金WE43的生产是通过选择性激光熔化(SLM)实现的。经过SLM,热等静压(HIP)和固溶热处理后,研究了该合金。仔细地表征了样品的微观结构和腐蚀行为,同时评估了样品并相对于常规铸造合金进行了对比。经过SLM制备的标本具有独特的微观结构,其中包括在优化SLM参数和HIP处理后,沿构造方向生长具有[0001]强烈纹理的细晶粒,且工艺诱导和冶金缺陷的比例很小,达到<0.1%。电化学测量表明,与铸造的SLM相比,SLM制备的WE43的阴极活性更高。提出这种行为是由于高密度的富锆氧化物颗粒均匀地分布在整个合金微观结构中,以及由于SLM的高冷却速率导致固溶体基质的化学组成发生了变化。还注意到,氧化物颗粒主要来自粉末。目前的结果表明,一旦进一步了解和控制粉末特性的影响,可以大大改善SLM制备的Mg合金的腐蚀。

更新日期:2020-05-23
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