Additively manufactured high strength aluminium (Al) alloy AA7075 was prepared using selective laser melting (SLM). High strength Al-alloys prepared by SLM have not been widely studied to date. The evolution of microstructure and hardness, with the attendant corrosion, were investigated. Additively manufactured AA7075 was investigated both in the “as-produced” condition and as a function of artificial ageing. The microstructure of specimens prepared was studied using electron microscopy. Production of AA7075 by SLM generated a unique microstructure, which was altered by solutionising and further altered by artificial ageing—resulting in microstructures distinctive to that of wrought AA7075-T6. The electrochemical response of additively manufactured AA7075 was dependent on processing history, and unique to wrought AA7075-T6, whereby dissolution rates were generally lower for additively manufactured AA7075. Furthermore, immersion exposure testing followed by microscopy, indicated different corrosion morphology for additively manufactured AA7075, whereby resultant pit size was notably smaller, in contrast to wrought AA7075-T6.

使用选择性激光熔化（SLM）制备了增材制造的高强度铝（Al）合金AA7075。迄今为止，由SLM制备的高强度铝合金尚未得到广泛的研究。研究了伴随腐蚀的组织和硬度的演变。添加剂制造的AA7075在“原样”状态下以及根据人工时效进行了研究。使用电子显微镜研究了所制备样品的微观结构。SLM生产AA7075产生了一个独特的微观结构，该微观结构通过固溶进行了更改，并通过人工时效进行了进一步更改，从而产生了与锻造的AA7075-T6不同的微观结构。增材制造的AA7075的电化学响应取决于加工历史，并且是锻造AA7075-T6所独有的，因此，增材制造的AA7075的溶出度通常较低。此外，浸没暴露测试后再进行显微镜检查，表明添加制造的AA7075的腐蚀形态不同，与锻造AA7075-T6相比，由此产生的凹坑尺寸明显更小。