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Critical assessments of accommodation process by liquid phase for superplastic flow in Si3N4/Al–Mg–Si metal matrix composites

  • Mamoru Mabuchi (a1), Hajime Iwasaki (a2), Ha-Guk Jeong (a3), Kenji Hiraga (a3) and Kenji Higashi (a4)...

Abstract

A liquid phase serves to relax stress concentrations caused by sliding at interfaces and grain boundaries in high-strain-rate superplasticity for aluminum matrix composites. However, the presence of a liquid phase does not always lead to high-strain-rate superplasticity because too much liquid causes decohesion at a liquid phase. The critical conditions of the optimum distribution, thickness, and volume in a liquid phase are discussed based on the observation results by differential scanning calorimetry and transmission electron microscopy. As a result, a very thin and discontinuous liquid phase is required both to assist relaxation of the stress concentrations and to limit decohesion at a liquid phase.

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Critical assessments of accommodation process by liquid phase for superplastic flow in Si3N4/Al–Mg–Si metal matrix composites

  • Mamoru Mabuchi (a1), Hajime Iwasaki (a2), Ha-Guk Jeong (a3), Kenji Hiraga (a3) and Kenji Higashi (a4)...

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