中国激光, 2018, 45 (5): 0502004, 网络出版: 2018-05-02
热处理工艺对激光增材制造铝锂合金组织及力学性能的影响 
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Effect of Heat Treatment Process on Microstructures and Mechanical Properties of Laser Additive Manufactured Al-Li Alloys
激光技术 激光增材制造 铝锂合金 组织演变 力学性能 laser technique laser additive manufacturing Al-Li alloy microstructure evolution mechanical properties
摘要
采用激光增材制造技术制备了铝锂合金板材, 分析了铝锂合金在热处理过程中析出相的演变及力学性能的变化。结果表明, 沉积态铝锂合金主要由α(Al)基体和TB(Al7Cu4Li)相组成, 晶界处存在少量富铜相；退火后, TB相更加均匀密集地分布在晶粒内部, 富铜相基本溶解, 晶界处存在少量Al-Cu-Fe杂质相；固溶淬火后, TB相固溶到基体中, 晶内存在少量δ′(Al3Li)相；时效后, 主要弥散析出θ′(Al2Cu)和σ(Al5Cu6Mg2)相。热处理后铝锂合金的显微硬度、抗拉强度比沉积态的分别提高了47.6%和87.7%。
Abstract
The Al-Li alloy plates are fabricated by the laser additive manufacturing technique and the evolution of precipitation phase and the change of mechanical properties during the heat treatment process of Al-Li alloys are analyzed. The results show that the as-deposited microstructures of Al-Li alloys mainly consist of α(Al) matrix and TB(Al7Cu4Li) phase, and there exists a small amount of copper-rich phase in the grain boundary. After annealing, the TB phase is more evenly distributed inside the grains, where the copper-rich phase almost disappears and the Al-Cu-Fe impurity phase is rarely present in the grain boundary. After solid solution quenching, the TB phase is nearly dissolved in the matrix and a small amount of δ′(Al3Li) phase appears. After aging, numerous θ′(Al2Cu) and σ(Al5Cu6Mg2) are mainly precipitated. After heat treatment, the microhardness and tensile strength of Al-Li alloys are increased by 47.6% and 87.7%, respectively, if compared with those of as-deposited alloys.
王欣, 刘栋, 程序. 热处理工艺对激光增材制造铝锂合金组织及力学性能的影响[J]. 中国激光, 2018, 45(5): 0502004. Wang Xin, Liu Dong, Cheng Xu. Effect of Heat Treatment Process on Microstructures and Mechanical Properties of Laser Additive Manufactured Al-Li Alloys[J]. Chinese Journal of Lasers, 2018, 45(5): 0502004.
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