Mg 첨가에 따른 A356 합금의 열처리 및 기계적 특성 변화

• Published in: 한국주조공학회지 Vol. 36; no. 6; pp. 195 - 201
• Main Authors: 조재찬, 김광삼, 임인택, 김대환, 심성용, 임수근, Jo, Jae-Chan, Kim, Kwang-Sam, Im, In-Taek, Kim, Dae-Hwan, Shim, Sung-Yong, Lim, Su-Gun
• Format: Journal Article
• Language: Korean
• Published: 한국주조공학회 01.12.2016
• Subjects: 금속공학; Refinement; Heat treatment; Mg addition; A356; Mg_2Si$ phase
• ISSN: 1598-706X; 2288-8381

The effects of Mg addition on heat treatment and mechanical properties of A356 alloy were investigated. With increased amounts of Mg addition to A356 alloy, the grain size decreased and eutectic Si was refined. And, this process can improve the mechanical properties. Solid solution heat treatment causes the spheroidizing of eutectic Si. In this study, although eutectic Si was refined with Mg addition, solid solution time increased from 2 hours to 6 hours with Mg addition, and aging time also increased, from 4 hours to 8 hours. After heat treatment, Mg2Si remained in a formation of Chinese script. And, Chinese script Mg2Si formed with Mg addition caused a reduction of the elongation of the alloys according to the stress concentration.