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pISSN : 1598-706X / eISSN : 2288-8381


(논문)연구논문

한국주조공학회지 (37권1호 14-20)

Heat Treatment of AZ91-5wt.%Sn Magnesium Alloy

AZ91-5wt.%Sn 마그네슘 합금의 열처리의 특성

Dae-Hwan Kim and Su-Gun Lim†

Dept. of materials manufacturing processing, ERI, Gyeongsang National Univ.

DOI : http://dx.doi.org/10.7777/jkfs.2017.37.1.14

Abstract

The microstructure, electrical conductivity and hardness variation of an AZ91-5wt%Sn Mg alloy sample during a solid-solution and aging heat treatment were instigated by optical microscopy, scanning electron microscopy, X-ray diffraction and by Rockwell hardness techniques in this study. The XRD result shows that the main phases in the as-casted alloy are α-Mg, Mg17Al12 and Mg2Sn. From the SEM images of the AZ91-5wt%Sn Mg alloy after the solution treatment, the Mg17Al12 phases in the alloy were found to have dissolved into the matrix with an increase in the holding time during the solution treatment, but Mg2Sn phases were clearly observable. The highest peak hardness of the AZ91 5wt%Sn Mg alloy after the solution treatment, the Mg17Al12 phases in the alloy were found to have dissolved into the matrix with an increase in the holding time during the solution treatment, but Mg2Sn phases were clearly observable. The highest peak hardness of the AZ91-5wt%Sn Mg alloy is 82HRE at an aging temperature of 200oC.

Keywords

Aging behavior, Solution treatment, Sn addition, Mg2Sn, AZ91 alloy