Realizing superior high-temperature mechanical properties in Laser Powder Bed Fusion Al-Mn-Mg-Sc-Zr alloy via dual-nanoprecipitation strengthening

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A Pub Date : 2025-02-01 DOI:10.1016/j.msea.2024.147660

Changyi Yang , Shufan Wu , Zhenhua Li , Wentao Jiang , Chaoli Ma , Wenlong Xiao

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引用次数: 0

Abstract

Laser Powder Bed Fusion (LPBF) additive manufacturing technology offers a route for developing high-performance Al alloys. This study utilized LPBF to fabricate Al-Mn-Mg-Sc-Zr alloys, focusing on the high-temperature mechanical properties and fracture behavior. Results indicate that the alloy with bimodal structure exhibits an excellent strength-ductility balance from room temperature to 250 °C, with a yield strength of 512 MPa and an elongation of 12.3 % at room temperature, and a yield strength of 370 MPa and an elongation of 12.0 % at 250 °C. Even at 300 °C, this alloy retains a satisfactory yield strength of 269 MPa. The exceptional high-temperature performance results from the Al₃Sc and Al₆Mn dual-nanoprecipitation strengthening. However, high temperature ductility dip occurs at temperatures above 300 °C due to the coarsening of Al₆Mn precipitates in the fine-equiaxed grain regions. This study provides valuable insights for designing the microstructure of heat-resistant Al alloys used in additive manufacturing.

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来源期刊

Materials Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.