Microstructure, mechanical properties and multiphase synergistic strengthening mechanisms of LPBF fabricated AlZnMgZr alloy with high Zn content

被引：15

作者：

Bi, Jiang ^{[1
]}

Wang, Keqi ^{[1
]}

Wu, Chen ^{[1
]}

Liu, Bokun ^{[1
]}

Chi, Jinze ^{[1
]}

Qin, Xikun ^{[2
]}

Chen, Wei ^{[1
]}

Starostenkov, Mikhail Dmitrievich ^{[4
]}

Dong, Guojiang ^{[1
]}

Chen, Xi ^{[2
,3
]}

Tan, Caiwang ^{[2
]}

机构：

[1] Yanshan Univ, Key Lab Adv Forging & Stamping Technol & Sci, Minist Educ, Qinhuangdao 066004, Peoples R China

[2] Harbin Inst Technol, State Key Lab Precis Welding & Joining Mat & Struc, Harbin 150001, Peoples R China

[3] Harbin Inst Technol, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Peoples R China

[4] Altai State Tech Univ, Gen Phys Dept, Leninst 46, Barnaul 656099, Russia

来源：

ADDITIVE MANUFACTURING | 2024年 / 89卷

关键词：

Powder bed fusion; Al14ZnMgZr alloy; Microstructural feature; Mechanical properties; Strengthening mechanism; MG-CU ALLOY; TENSILE PROPERTIES; THERMAL-STABILITY; BEHAVIOR;

D O I：

10.1016/j.addma.2024.104305

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this work, a novel aluminum alloy with high Zn content was designed for laser powder bed fusion (LPBF) forming process. Aluminum alloy powder containing 14 wt% Zn and 2 wt% Zr was produced to conduct LPBF experiments with different process parameters. The analysis of the specimens revealed that the up facing surface exhibited an average microhardness peak value of 170.6 HV, achieving the ultimate tensile strength (UTS) of 573 MPa and the elongation of 11.6 %. There was no significant change in grain size and a large amount of platelike eta' (a metastable precipitate MgZn2 phase) phase precipitated within the grains after aging treatment (120 degrees C, 21 h). The specimen reached the average microhardness peak of 181.7 HV and the UTS of 605 MPa. The principal strengthening mechanisms in the LPBF-formed samples were solid solution strengthening and grain refinement strengthening. After aging treatment, the precipitation of the second phase from solute atoms led to grain refinement strengthening and second-phase strengthening becoming the predominant factors to enhance the sample's strength. Al14ZnMgZr alloy have great application prospect in high strength and tough service environment.

引用

页数：15

共 46 条

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