Prevention of macrosegregation in squeeze casting of an Al-4.5 wt pct Cu alloy
- Yonsei Univ., Seoul (Korea, Republic of). Dept. of Metallurgical Engineering
The squeeze casting of an Al-4.5 wt pct Cu alloy was carried out to investigate the conditions for the formation and the prevention of macrosegregation. The effects of the process parameters, applied pressure, die temperature, pouring temperature, delay time, and humidity on the formation of macrosegregation were investigated in correlation with the evolution of macrostructure and shrinkage defects. Two critical applied pressures were defined: one is the critical applied pressure, P{sub SC}, under which shrinkage defects from, and the other is the critical applied pressure, P{sub MS}, above which macrosegregates form in the squeeze castings. A quantitative diagram describing the optimum process conditions was proposed for obtaining sound squeeze castings. It was found that the pouring temperature, the die temperature, the delay time, and the humidity are closely related to the two critical applied pressures P{sub SC} and P{sub MS}, in different manners. It was concluded that sound castings without macrosegregation and shrinkage defects can only be obtained when the applied pressure is in the range of P{sub SC} < P < P{sub MS}.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 605833
- Journal Information:
- Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Vol. 29, Issue 1; Other Information: PBD: Jan 1998
- Country of Publication:
- United States
- Language:
- English
Similar Records
Infiltration of Al{sub 2}O{sub 3} short-fiber preforms during squeeze
Eutectic channelling in a squeeze cast Al-4.5Wt%Cu alloy