线+激光定向能沉积制备AA7075 + TiC的时效响应

IF 1.9 Q3 ENGINEERING, MANUFACTURING

Manufacturing Letters Pub Date : 2025-03-20 DOI:10.1016/j.mfglet.2025.03.001

Taha Waqar , Emma Pugsley , Haiou Jin , Amir Horr , Mark A. Easton , Michael J. Benoit

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引用次数: 0

摘要

本研究的目的是评估激光定向能沉积TiC纳米颗粒在AA7075丝中的作用，以促进晶粒细化和消除裂纹。显微组织分析表明，TiC团簇分布不均匀，形成了等轴晶和柱状晶的混合体。研究了T6直接时效和传统时效热处理的效果，结果表明，在120℃下加热5 h的直接时效试样硬度与T6热处理试样硬度相当（115 HV0.5）。然而，由于印刷过程中Zn和Mg的蒸发，没有一种时效硬化条件与变形后的AA7075硬度相匹配。

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Aging response of AA7075 + TiC fabricated by wire + laser directed energy deposition

The objective of this study is to evaluate laser directed energy deposition of AA7075 wire with TiC nanoparticles to promote grain refinement and eliminate cracking. Microstructure analysis showed the presence of a nonuniform distribution of TiC clusters and the formation of a mix of equiaxed and columnar grains. The effect of direct and traditional T6 aging heat treatments was studied, and it was shown that the direct aged sample heated for 5 hrs at 120 °C was of comparable hardness to the T6 heat-treated sample (115 HV0.5). However, no age hardening conditions matched the hardness of wrought AA7075, due to evaporation of Zn and Mg during printing.

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