View in EDS

Study on the microstructure and mechanical properties of AZ91/AZ31 layered heterostructured magnesium alloys manufactured by wire arc additive manufacturing.

Saved in:
Bibliographic Details
Title: Study on the microstructure and mechanical properties of AZ91/AZ31 layered heterostructured magnesium alloys manufactured by wire arc additive manufacturing.
Authors: Long, Rui1,2 (AUTHOR), Niu, Haoyi1,3 (AUTHOR), Yang, Xusheng1,2,4,5 (AUTHOR) yangxushengcq@foxmail.com, Kou, Gang1,3 (AUTHOR), Ma, Zhenduo1,3 (AUTHOR), Hu, Kaiqi1,3 (AUTHOR), Liu, Xinxin1,3 (AUTHOR), Feng, Jingkai1,3 (AUTHOR) fjkrmmi@163.com
Source: Journal of Alloys & Compounds. Jul2026, Vol. 1076, pN.PAG-N.PAG. 1p.
Subjects: Magnesium alloys, Microstructure, Mechanical behavior of materials, Grain refinement, Tensile strength, Fracture mechanics
Abstract: In this work, AZ91 alloy and AZ91/AZ31 layered alloy were fabricated by wire arc additive manufacturing (WAAM) with swing deposition strategy. The microstructure, room-temperature tensile properties, fracture behavior and deformation mechanism of the two alloys were systematically investigated. Results show that compared with the monolithic AZ91 alloy, the AZ91/AZ31 layered alloy presents remarkable microstructural optimization, including grain refinement at heterogeneous interfaces, weakened basal texture, reduced and uniformly dispersed second phases, as well as eliminated brittle continuous intergranular networks. The layered structure induces sequential yielding of soft AZ31 layers and hard AZ91 layers, accompanied by stable strain hardening and heterogeneous deformation-induced strengthening, thus significantly improving the strength, ductility and uniformity of mechanical properties. During tensile deformation, the layered configuration generates multiaxial stress states and interlayer constraints, which favor the stable formation of {10−12} tension twins and higher density geometrically necessary dislocations, leading to more uniform plastic deformation. Moreover, the fracture mode of AZ91 is dominated by intergranular fracture, while the AZ91/AZ31 layered alloy exhibits ductile transgranular fracture with abundant dimples. Overall, the heterogeneous layered structure effectively breaks the strength-ductility trade-off in conventional magnesium alloys, achieving synchronous improvement of strength, ductility and service stability. • Oscillating CMT-WAAM AZ91/AZ31 laminate optimizes microstructures. • Interfaces refine grains and fragment brittle β-Mg₁₇Al₁₂ into fine particles. • Interlayer stress induces dense {10−12} twins and GNDs for homogeneous plasticity. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Alloys & Compounds is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
Description
Abstract:In this work, AZ91 alloy and AZ91/AZ31 layered alloy were fabricated by wire arc additive manufacturing (WAAM) with swing deposition strategy. The microstructure, room-temperature tensile properties, fracture behavior and deformation mechanism of the two alloys were systematically investigated. Results show that compared with the monolithic AZ91 alloy, the AZ91/AZ31 layered alloy presents remarkable microstructural optimization, including grain refinement at heterogeneous interfaces, weakened basal texture, reduced and uniformly dispersed second phases, as well as eliminated brittle continuous intergranular networks. The layered structure induces sequential yielding of soft AZ31 layers and hard AZ91 layers, accompanied by stable strain hardening and heterogeneous deformation-induced strengthening, thus significantly improving the strength, ductility and uniformity of mechanical properties. During tensile deformation, the layered configuration generates multiaxial stress states and interlayer constraints, which favor the stable formation of {10−12} tension twins and higher density geometrically necessary dislocations, leading to more uniform plastic deformation. Moreover, the fracture mode of AZ91 is dominated by intergranular fracture, while the AZ91/AZ31 layered alloy exhibits ductile transgranular fracture with abundant dimples. Overall, the heterogeneous layered structure effectively breaks the strength-ductility trade-off in conventional magnesium alloys, achieving synchronous improvement of strength, ductility and service stability. • Oscillating CMT-WAAM AZ91/AZ31 laminate optimizes microstructures. • Interfaces refine grains and fragment brittle β-Mg₁₇Al₁₂ into fine particles. • Interlayer stress induces dense {10−12} twins and GNDs for homogeneous plasticity. [ABSTRACT FROM AUTHOR]
ISSN:09258388
DOI:10.1016/j.jallcom.2026.189297