The characteristics of intermetallic compounds and hardness of Ni-Cr/AC8A composites under different infiltration temperatures

• Published in: Journal of mechanical science and technology Vol. 26; no. 8; pp. 2627 - 2630
• Main Authors: Lee, WonJun, Hwang, HoJun, Kim, HyeongJo, Park, CheolHong, Huh, SunChul, Park, WonJo
• Format: Journal Article
• Language: English
• Published: Heidelberg Korean Society of Mechanical Engineers 01.08.2012; Springer Nature B.V; 대한기계학회
• Subjects: Aluminum base alloys; Aluminum matrix composites; Control; Dynamical Systems; Engineering; Industrial and Production Engineering; Infiltration; Intermetallic compounds; Intermetallics; Mechanical Engineering; Metal matrix composites; Nickel; Preforms; Vibration; 기계공학; Metal matrix composites; Inter-metallic compounds; Microstructure; Hardness; Low pressure infiltration
• ISSN: 1738-494X; 1976-3824
• DOI: 10.1007/s12206-012-0643-9

With the rapid development of aerospace and automobile industries, there is an increasing need for structural materials with excellent mechanical properties such as can be used at high temperatures. Aluminum matrix composite have attracted much attention because of its excellent performance, particularly the existence of the high temperature resistance inter-metallic compounds. Aluminum-based composites with inter-metallic compounds have been studied recently. In this study, Ni-Cr porous preform is reinforcement when Al-alloy (AC8A) is base metal and Ni-Cr/AC8A composites were manufactured under low pressure infiltration limited to the maximum of 0.5 Mpa at 700°C, 750°C, 800°C and 850°C, respectively. The microstructure and phase composition of the composites were evaluated by optical microscope, X-ray diffraction (XRD) and electro-probe micro analyzer (EPMA), intermetallic compounds Al 3 Ni and CrSi were found as newly formed phases in the composites. In addition, Vickers hardness of Ni-Cr composites was also tested.