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A1-4%Cu 및 A1-4%Cu-0.06%Sn 合金의 時效現象에 미치는 燒入溫度의 影響
趙顯麒,崔甲松 慶北大學校 1981 論文集 Vol.32 No.-
An investigation for influences of quenching temperature on ageing phenomena in Al-4%Cu and Al-4%Cu-0.06%Sn alloys has been carried out by means of the measurements of electrical resistance, hardness and tensile strength. The results obtained are summarized as follows. Hardness and electrical resistance increased remarkably with increasing of quenching temperature in both alloy at the as-quenched state. The age-hardening at the quenching temperature, 550℃ is more pronounced at the initial stage of ageing, but at the quenching temperature, 520℃ is more pronounced at the later state of ageing. The relation between the quench cluster and the initial age-hardening is indifferent if the case of step quenching which produces more the quenching cluster. The initial age-hardening is remarkably retarded in the case of up-quenching. Especially, initial age-hardening of ternary alloy is more than that of binary alloy.
생체의학 임플란트재료로서 Ti-Nb계 합금의 조직과 기계적 성질에 미치는 HEMM의 영향
우기도,최갑송,이현범,김인용,Woo, Kee-Do,Choi, Gab-Song,Lee, Hyun-Bum,Kim, In-Yong,Zhang, Deliang 한국재료학회 2007 한국재료학회지 Vol.17 No.11
Al-42wt%Nb powder was prepared by high-energy mechanical milling(HEMM). The particle size, phase transformation and microstructure of the as-milled powder were investigated by particle size distribution (PSD) analyzer, scanning electron microscopy (SEM), X-ray diffractometery (XRD), transmission electron microscopy (TEM)and differential thermal analysis (DTA). The milled powders were heated to a sintering temperature at 1000C with under vaccum with vaccum tube furnace. Microstructural examination of sintered Ti-42wt%Nb alloy using 4h-milled powder showed Ti-rich phases (${\alpha}$-Ti) which are fine and homogeneously distributed in the matrix (Nb-rich phase: ${\beta}$-Ti). The sintered Ti-42wt%Nb alloy with milled powder showed higher hardness. The microstructure of the as quenched specimens fabricated by sintering using mixed and milled powder almost are same, but the hardness of as quenched specimen fabricated by using mixed powder increased due to solution hardening of Nb in Ti matrix. The aging effect of these specimens on microstructural change and hardening is not prominent.