강소성 유한요소법을 이용한 ZAM631 마그네슘합금의 압출변형거동에 관한 연구

• Published in: 대한금속·재료학회지, 53(8) Vol. 53; no. 8; pp. 569 - 577
• Main Authors: 최기순, Ki Soon Choi, 황지훈, Ji Hoon Hwang, 이경훈, Kyunghoon Lee, 신광선, Kwang Seon Shin
• Format: Journal Article
• Language: Korean
• Published: 대한금속재료학회 31.08.2015; 대한금속·재료학회
• Subjects: alloys; compression test; extrusion; finite element method; microstructure; 재료공학
• ISSN: 1738-8228; 2288-8241
• DOI: 10.3365/KJMM.2015.53.8.569

A uniaxial hot compression test was carried out under a strain rate range of 10-3~1/s at a temperature range of 533~653K to evaluate the flow stress features of ZAM631 Magnesium (Mg) alloy. The peak value of flow stress increased with increasing strain rate at constant temperature. In contrast, an increase in the deformation temperature at a constant strain rate resulted in a decrease of the peak value of the flow stress. Microstructure examination of the specimens showed that dynamic recrystallization (DRX) took place in both compressed and extruded specimens. The flow stress information was further used to simulate the indirect extrusion process for the ZAM631 alloy. Non-isothermal finite element simulations were carried out by a rigid plastic finite element method. Extrusion deformation behaviors such as temperature, strain rate and strain were compared at different locations of the deformed billet during extrusion. (Received December 30, 2014)