Influence of heat treatment on microstructure evolution and mechanical properties of TiB2/Al 2024 composites fabricated by directed energy deposition

被引：55
作者：
Chen, Bo [1 ,2 ]
Xi, Xin [2 ]
Gu, Tao [2 ]
Tan, Caiwang [1 ,2 ]
Song, Xiaoguo [1 ,2 ]
机构：
[1] Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Peoples R China
[2] Harbin Inst Technol Weihai, Shandong Prov Key Lab Special Welding Technol, Weihai 264209, Peoples R China
来源：
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2020年 / 9卷 / 06期
关键词：
Directed energy deposition; Al; 2024; Microstructure evolution; Mechanical properties; Heat treatment; LASER; ALLOY; BEHAVIOR; PARTICLES; HARDNESS;
D O I：
10.1016/j.jmrt.2020.10.014
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The influence of heat treatment on microstructure evolution and mechanical properties of TiB2/A1 2024 composites fabricated by laser-powder directed energy deposition (DED) were investigated. The results showed that the addition of TiB2 resulted in a significant grains refinement with random orientation. Compared with DED-Al 2024, a lot of network -like 0Al(2)Cu phases was generated in the as-eposited TiB2/Al 2024 composite, leading to low plasticity. After 10h solution treatment, the 0 phase disappeared, the thermally stable block T-Al20Cu2Mn3 phase was formed and the ultimate tensile strength (UTS) and elongation improved due to solution strengthening. During the aging process, Cu element was precipitated and semi-coherent 0' phase was generated, improving the effect of Orowan strengthening. The composite material reached the maximum UTS of 453.65 MPa after 10h aging. The yield strength (YS) enhanced with the increase of aging time. After 15h aging, the YS and microhardness reached the maximum of 245.73 MPa and 133.50HV, respectively. This research provides a theoretical basis for the repair and manufacture of Al 2024 alloy and composite parts. (C) 2020 The Author(s). Published by Elsevier B.V.
引用
收藏
页码：14223 / 14236
页数：14
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