铝合金激光粉末床熔融(Laser Powder Bed Fusion,LPBF)增材制造是实现高端装备关键构件轻量化、复杂化、整体化成形的重要手段.然而目前LPBF成形高强铝合金面临裂纹难抑制、强度难提升的技术挑战.通过构建Al-Ce-Ni三元共晶体系与Ti、Zr元素孕育处理方法,提出了一种适用于LPBF工艺的新型无裂纹高强铝合金,研究了 Al-Ce-Ni-Zr-Ti合金的LPBF工艺优化、显微组织和拉伸性能.发现激光能量密度区间在71.4～87.5 J/mm3内时打印无裂纹、未发生明显翘曲变形,铝基体中形成了Al11Ce3和Al3Ni强化相,同时析出的Al3(Ti,Zr)粒子显著促进了晶粒细化与等轴化,极限抗拉强度达(550.33±20.55)MPa,屈服强度达(401.67±17.79)MPa,伸长率 4.68％±0.12％.
Microstructure and Tensile Properties of Al-Ce-Ni Alloy Produced by Laser Powder Bed Fusion
Laser Powder Bed Fusion(LPBF)additive manufacturing of aluminum alloy is an important means to achieve lightweight,complex,and integrated forming of key components for high-end equipment.However,the currently LPBF forming of high-strength aluminum alloys faces technical challenges of difficult crack suppression and strength improvement.This article proposed a new type of crack free high-strength aluminum alloy suitable for LPBF process by constructing an Al-Ce-Ni ternary eutectic system and incorporating Ti and Zr elements.The LPBF process optimization,microstructure,and tensile properties of Al-Ce-Ni-Zr-Ti alloy were studied.It is found that when the laser energy density is within the range of 71.4-87.5 J/mm3,there are no cracks or significant warping deformation in the printed material.Al11Ce3 and Al3 Ni strengthening phases form in the aluminum matrix,and the precipitated Al3(Ti,Zr)particles significantly promote grain refinement and equiaxiality.The ultimate tensile strength is(550.33±20.55)MPa,the yield strength is 401.67±17.79 MPa,and the elongation rate is 4.68％±0.12％.
laser powder bed fusionaluminum alloyprocess optimizationmicrostructuretensile properties
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