时效处理对电弧熔丝增材制造2319铝合金性能及断裂行为的影响

doi:10.13251/j.issn.0254-6051.2024.08.010

摘要/Abstract

摘要： 研究了时效时间对电弧熔丝增材制造2319铝合金微观组织与力学性能的影响,并对拉伸试样的断裂机理进行分析。结果表明,随着时效时间的延长,合金内部析出相数量逐渐增加,尺寸增大。析出相主要为Al₂Cu,同时还有富Fe、Mn杂质相。时效后合金水平方向的抗拉强提升至450 MPa,垂直方向抗拉强度达到350 MPa,但是伸长率下降。微小气孔的聚集,θ(Al₂Cu)相以及富Fe、Mn杂质相沿晶界的偏聚,造成水平方向和垂直方向各向异性,同时大量微气孔沿层间分布,微小气孔聚集连接长大,形成裂纹导致样件断裂失效。

关键词: 电弧熔丝增材制造, 2319铝合金, 微观组织, 力学性能, 时效, 断裂机理

Abstract: Effect of aging time on microstructure and mechanical properties of 2319 aluminum alloy fabricated by wire arc additive manufacturing was studied, and the fracture mechanism of tensile specimens was analyzed. The results indicate that with the prolongation of aging time, the number and size of precipitated phases in the alloy gradually increase. The precipitates are mainly Al₂Cu phase, as well as Fe- and Mn-rich impurity phases. After aging, the tensile strength in horizontal direction of the alloy increases to 450 MPa, and the tensile strength in vertical direction reaches 350 MPa, but the elongation decreases. The aggregation of small pores, as well as the segregation of θ(Al₂Cu) phase and Fe- and Mn-rich impurity phases along grain boundaries, result in the anisotropy of the alloy in both horizontal and vertical directions. At the same time, a large number of micro pores are distributed along the interlayer, and they aggregate and grow together, forming cracks that lead to the fracture and failure of the specimen.

Key words: wire arc additive manufacturing, 2319 aluminum alloy, microstructure, mechanical properties, aging, fracture mechanism

中图分类号:

华文娟, 张建勋. 时效处理对电弧熔丝增材制造2319铝合金性能及断裂行为的影响[J]. 金属热处理, 2024, 49(8): 60-66.

Hua Wenjuan, Zhang Jianxun. Effect of aging treatment on properties and fracture behavior of 2319 aluminum alloy fabricated by wire arc additive manufacturing[J]. Heat Treatment of Metals, 2024, 49(8): 60-66.

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