Effect of rare earth addition on microstructure and properties of Al-Mg-Si alloy

doi:10.13251/j.issn.0254-6051.2024.07.015

Abstract

Abstract: Single wires of Al-Mg-Si alloys with rare earth addition (Ce or Sc) and without rare earth(RE) addition were prepared by hot rolling and cold drawing, and aged at 175 ℃ for different time. Microstructure of the alloy wires was observed by SEM and TEM, while the tensile strength and elongation were obtained by tensile test with electrical universal testing machine, and the resistance was also tested on digital micro-ohmmeter. The results show that the morphologies and size characteristics of micro-scale AlFeSi particles are improved owing to the RE addition. During the aging process, Ce has no obvious effect on the characteristics of nanoscale precipitates, while Sc can inhibit the precipitation and growth process of nanoscale precipitates. Therefore, the β″ phase in Sc-containing alloys possesses minimum size and well-dispersed distribution. After aging at 175 ℃ for 4 h, considerably well-performed comprehensive properties are obtained for all the 3 alloys, among which the Ce-added alloy has the highest electric conductivity (about 56.2%IACS), while the Sc-added alloy exhibits the highest tensile strength (about 350 MPa).

Key words: Al-Mg-Si alloy, rare earth, microstructure, tensile strength, electrical conductivity

CLC Number:

TG244.2

Chen Baoan, Li Menglin, Chen Rui, Duo Junlong, Han Yu, Zhu Zhixiang, Yang Changlong, Miao Yaojun. Effect of rare earth addition on microstructure and properties of Al-Mg-Si alloy[J]. Heat Treatment of Metals, 2024, 49(7): 100-105.

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