Methods for Improving the Mechanical Properties of Arc Additive Aluminum Alloys Without Quenching Heat Treatment

Abstract

This invention relates to a method for improving the mechanical properties of arc additive manufacturing aluminum alloys without quenching heat treatment, comprising: designing the composition of a quench-free Al-Mg-Sc-(Zn / Ag / Cu) aluminum alloy for arc additive manufacturing: Mg as the main alloying element, content: 5.5-7.0 wt%; Sc as a trace alloying element, content: 0.30-0.70 wt%; and adding trace alloying elements Zn, Ag, and Cu individually or in combination, with Zn content: 0.5-1.5 wt%, Ag content: 0.2-1.0 wt%, and C content: 0.5-1.5 wt%, C content: 0.2-1.0 wt%, C content: 0.5-1.5 ... u content: 0.2-1.0 wt%; For the arc additive manufacturing process of quench-free Al-Mg-Sc-(Zn / Ag / Cu) aluminum alloys, a multi-laser assisted arc additive manufacturing method is adopted to achieve efficient melting and high-speed deposition, suppressing porosity and crack defects and improving the formed microstructure; for the post-aging treatment of quench-free Al-Mg-Sc-(Zn / Ag / Cu) aluminum alloys produced by arc additive manufacturing, in-situ aging or low-temperature aging is used to precipitate the strengthening phase from the supersaturated solid solution formed by high-speed melting and solidification, thereby improving mechanical properties. This invention achieves high-performance manufacturing under quench-free heat treatment conditions, avoiding the problem of large non-uniform deformation caused by solution quenching heat treatment required for conventional high-strength aluminum alloy arc additive manufacturing.

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