일방향 및 평직 CF,Mg 복합재 적층판의 부식에 따른 미세조직 및 기계적 특성 변화

• Published in: 대한금속·재료학회지, 50(9) Vol. 50; no. 9; pp. 697 - 702
• Main Authors: 임시온, Shi On Yim, 이정무, Jung Moo Lee, 이상관, Sang Kwan Lee, 박용호, Yong Ho Park, 박익민, Ik Min Park
• Format: Journal Article
• Language: Korean
• Published: 대한금속재료학회 20.09.2012; 대한금속·재료학회
• Subjects: composites; compression test; infiltration; residual stress; stress corrosion crack; 재료공학
• ISSN: 1738-8228; 2288-8241
• DOI: 10.3365/KJMM.2012.50.9.697

In this study, unidirectional and plain woven carbon fiber reinforced magnesium matrix composite laminates were fabricated by the liquid pressing infiltration process, and evolutions of the microstructure and compressive strength of the composite laminates under corrosion were investigated by static immersion tests. In the case of the unidirectional composite laminate, the main microstructural damage during immersion appeared as a form of corrosion induced cracks, which were formed at both CF/Mg interfaces and the interfaces between layers. On the otherhand, wrap/fill interface cracks were mainly formed in the plain woven composite laminate, without any cracks at the CF/Mg interface. The formation of these cracks was considered to be associated with internal thermal residual stress, which was generated during cooling after the fabrication process of these materials. As a consequence of the corrosion induced cracks, the thickness of both laminates increased in directions vertical to the fibers with increasing immersion time. With increasing immersion time, the compressive strengths of both composite laminates also decreased continuously. It was found that the plain woven composite laminates have superior corrosion resistance and stability under a corrosive condition than unidirectional laminates.