Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Failure and Deformation Analyses of 3-ply Mg/Al/STS Clad-Metalin Bending

굽힘시험시의 Mg/Al/STS 3층 클래드재의 변형 및 파단특성 분석

  • Kim, In-Kyu (Department of Advanced Materials Engineering, Chungnam National University) ;
  • Song, Jun-Young (Department of Advanced Materials Engineering, Chungnam National University) ;
  • Hwan, Oh-Ki (Department of Advanced Materials Engineering, Chungnam National University) ;
  • Hong, Sun Ig (Department of Advanced Materials Engineering, Chungnam National University)
  • 김인규 (충남대학교 나노소재공학과) ;
  • 송준영 (충남대학교 나노소재공학과) ;
  • 오기환 (충남대학교 나노소재공학과) ;
  • 홍순익 (충남대학교 나노소재공학과)
  • Received : 2011.11.09
  • Published : 2012.05.25
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Abstract

A three-point bending test was performed on roll-bonded Mg/Al/STS clad-metal plates under two different testing conditions (Mg layer in tension, or STS in tension) and their mechanical response and fracture behavior were investigated. Bending strength was found to be greater under the condition of Mg layer in tension. Heat treatment at $200^{\circ}C$ increased the bending formability, suggesting the interfacial strength increased at $200^{\circ}C$. Under the condition of Mg in tension, the clad heat-treated at $300^{\circ}C$ and $400^{\circ}C$ fractured in two steps, with the first step associated with the interfacial fracture between Mg and Al, and the second the fracture of the Mg layer. STS/Al layers were found to be bent without complete fracture. Under the condition of STS in tension, the clad heat-treated at $300^{\circ}C$ and $400^{\circ}C$ exhibited a very small load drop at the displacement, which is similar to that of the first load drop associated with the interfacial fracture under the condition of Mg in tension. In this case, no interfacial cracks were found and the complete cut-through fracture of clad was observed at low temperature heat treatment conditions, suggesting excellent interfacial strength. When the heat treatment temperature was higher than $300^{\circ}C$, interfacial cracks were observed. The local stress condition and the position of the interface with respect to the surface were found to have a great influence on the fracture behaviors of clad metals.

Keywords

Acknowledgement

Supported by : 지식경제부

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