장준연 문인기 2024-01-21T10:11:58Z 2024-01-21T10:11:58Z 2021-09-06 2002-08 1738-8228 https://pubs.kist.re.kr/handle/201004/139325 Hot compression test was performed on Al-10%Si-2%Cu-1%Mg-0.5%Mn ingot in the temperature range 440∼500℃ and in the strain rate range 0.1∼10/sec in order to understand the hot deformation features and to explore the possibility of uniform distribution of eutectic Si particles. A typical stress-strain curve was well established where the stress increases sharply in the beginning of the deformation, and then decreases gradually in the strain rate of 0.5∼10/sec. Apparent activation energy of 65 ㎉/㏖ and stress exponent of 8.4 were evaluated from the peak stress. Deformation at low strain rate and high temperature is favorable in view of low flow stress and relatively uniform distribution of Si particles. Hard Si eutectics between primary Al grains begin to deform after soft Al grains are easily elongated in an early stage of the deformation. This type of deformation mode strongly demands at least 0.7 true strain to break the net-work structure of eutectic Si effectively. It is suggested that suitable heat treatment prior to the hot deformation be employed to ensure uniform distribution of fine Si particles. Korean 대한금속·재료학회 Al-10%Si-2%Cu-1%Mg-0.5%Mn 합금 주괴의 고온변형 Hot Deformation of Al-10%Si-2%Cu-1%Mg-0.5%Mn Ingot Article 2 대한금속·재료학회지, v.40, no.8, pp.867 - 872 대한금속·재료학회지 40 8 867 872 kci ART000882718 hot deformation Al-Si alloy Eutectic Si Uniform distribution Modification activation energy stress-strain curve