Effect of annealing temperature on microstructure and mechanical properties of Al-3.5Mg alloy sheet for deep drawing

doi:10.13251/j.issn.0254-6051.2024.06.005

Abstract

Abstract: Effect of annealing temperature on the microstructure, conventional tensile properties and formability of Al-3.5Mg alloy sheet for deep drawing was studied by means of optical microscope, scanning electron microscope (SEM) and tensile test. The results show that with the increase of annealing temperature, the strength and yield ratio of the Al-3.5Mg alloy decreases in a ladder-shape, while the elongation gradually increases. The n, r- value and LDR value significantly increases, and the anisotropy increases first and than decreases. When the annealing temperature is raised from 340 ℃ to 360 ℃, the microstructure undergoes complete recrystallization evolution. An Hall-Petch empirical formula is established between yield strength and grain size. Engineering practice confirms that industrial production annealed at 360 ℃for 8 h can ensure the quality of deep drawing forming.

Key words: Al-3.5Mg alloy, annealing temperature, microstructure, formability

CLC Number:

TG166.3

Wu Zhenyu, Qin Yiming, Li Yongdi, Zhou Peilin, Zhou Jiaju, Li Qu. Effect of annealing temperature on microstructure and mechanical properties of Al-3.5Mg alloy sheet for deep drawing[J]. Heat Treatment of Metals, 2024, 49(6): 29-35.

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