The microstructure and mechanical properties of selectively laser melted AlSi10Mg: The effect of a conventional T6-like heat treatment
The microstructure and mechanical properties of selectively laser melted AlSi10Mg: The effect of a conventional T6-like heat treatment
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DOI：
10.1016/j.msea.2016.04.092
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发表时间：
2016-06-14
期刊：
影响因子：
6.4
通讯作者：
Everitt, Nicola M.
中科院分区：
文献类型：
--
作者：
Aboulkhair, Nesma T.;Maskery, Ian;Everitt, Nicola M.
铝的选择性激光熔化（SLM）是研究兴趣，因为其潜在的好处，在航空航天和汽车工业的高价值制造应用。为了证明SLM铝零件的可靠性，需要研究其机械性能。在本文中，SLM AlSi 10 Mg的纳米，微观和宏观尺度的力学性能进行了研究。此外，传统的T6样热处理的效果进行了研究，并与所产生的显微组织。纳米压痕显示SLM材料内的均匀硬度。热处理后，由于相变观察到显着的空间变化。结果发现，SLM材料的显微硬度超过其压铸对应物。热处理软化了材料，将显微硬度从125 +/- 1 HV降低到100 +/- 1 HV。最终的拉伸强度（333 MPa），超过了压铸对应的实现，这是稍微减少了热处理（12%），同时在应变失效（类似于三倍）的显着增益。对于能够承受高压缩应变的竣工材料，记录了显著高的压缩屈服强度。SLM特征微结构在负载下产生增强的强度，优于铸造材料。T6类热处理工艺的使用也改变了材料的性能，在材料的强度和延展性之间产生了潜在的有吸引力的折衷，使其更适合于更广泛的应用，并为增材制造工艺和合金组合开辟了更多的机会。(C)© 2016 Elsevier B. V.版权所有。
Selective laser melting (SLM) of aluminium is of research interest because, of its potential benefits to high value manufacturing applications in the aerospace and automotive industries. In order to demonstrate the credibility of SLM Al parts, their mechanical properties need to be studied. In this paper, the nano-, micro-, and macro-scale mechanical properties of SLM AlSi10Mg were examined. In addition, the effect of a conventional T6-like heat treatment was investigated and correlated to the generated microstructure. Nanoindentation showed uniform hardness within the SLM material. Significant spatial variation was observed after heat treatment due to phase transformation. It was found that the SLM material's micro-hardness exceeded its die-cast counterpart. Heat treatment softened the material, reducing micro-hardness from 125 +/- 1 HV to 100 +/- 1 HV. An ultimate tensile strength (333 MPa), surpassing that of the die cast counterpart was achieved, which was slightly reduced by heat treatment (12%) alongside a significant gain in strain-to-failure (similar to threefold). Significantly high compressive yield strength was recorded for the as-built material with the ability to withstand high compressive strains. The SLM characteristic microstructure yielded enhanced strength under loading, outperforming cast material. The use of a T6-like heat treatment procedure also modified the properties of the material to yield a potentially attractive compromise between the material's strength and ductility making it more suitable for a wider range of applications and opening up further opportunities for the additive manufacturing process and alloy combination. (C) 2016 Elsevier B.V. All rights reserved.