발간논문

Home > KJMM 논문 > 발간논문

Vol.52, No.5, 347 ~ 353, 2014
Title
Effect of Sr Content on Creep Properties of Mg-4Al-2Sn Alloy
최종민 Jong Min Choi , 김대한 Dae Han Kim , 조대현 Dae Hyun Cho , 최윤석 Yoon Suk Choi , 박익민 Ik Min Park
Abstract
Creep rupture properties and microstructures of an as-cast Mg-4Al-2Sn alloy with and without Sr contents (1 wt% and 2 wt%) were investigated. Creep rupture tests were performed at 150℃ and 200℃ at 50 MPa and 70 MPa. The microstructure of the Mg-4Al-2Sn alloy initially had Mg17Al12 and Mg2Sn phases. The addition of Sr resulted in the formation of a ternary MgSnSr phase. Creep strength increased with an increasing Sr due to thermally stable MgSnSr precipitates, which suppressed coarsening of the Mg17Al12precipitates during creep. Scanning electron microscopy showed that Mg17Al12 phases at the grain bounda-ries are the starting point of void initiation, the cracks propagated along the grain boundaries. However, the MgSnSr phase interrupted crack propagation.
Key Words
magnesium alloys, casting, creep test
| PDF
대한금속∙재료학회 │ (06633) 서울시 서초구 서초대로 56길 38 대한금속∙재료학회 회관 (서초1동 1666-12번지)
Tel : 070-4266-1646 │ FAX : 02-557-1080 │ E-mail : metal@kim.or.kr
Copyright ⓒ 2013 사단법인 대한금속∙재료학회 All rights reserved.