A Study on the Precipitates in Rapidly Quenched Al-Ti-Zr Alloys

Al-Ti-Zr速凝合金之析出相研究

曹春暉(Chun-Huei Tsau)

《華岡工程學報》 15期 (2001/06) Pp. 65-73

https://doi.org/10.29987/CCUHKJE.200106.0005

摘要

本實驗以兩種成分之Al-Ti-Zr合金在425℃進行時效處理，研究基地內部析出相的成長及穩定性。結果顯示增加Zr含量曾加快析出物的成長速率，而Ll2結構Al3(Ti0.25Zr0.75)及Al3(Ti0.75Zr0.25)析出物的成長速率分別爲3.94×10^(-28)立方公尺/hr及1.61×10^(-28)立方公尺/hr。尖峰時效出現在425℃時效處理100小時，而Al-0.65Ti-3.22Zr及Al-1.74Ti1.14Zr合金的尖峰時效硬度分別爲HV75及HV78。

並列摘要

Two kinds of Al-Ti-Zr alloys were prepared to investigate the coarsening of the spherical L12-structured Al3(Ti, Zr) precipitates aging at 425℃for various periods of time. The results indicated that the increasing of Zr-content would result in increasing the coarsening rate of the precipitates. The coarsening coefficients of Ll2 structured Al3(Ti0.25Zr0.75) and A13(Ti0.75Zr0.25) precipitates in these Al-5vol.%Al3(Ti. Zr) alloys are 3.94×10^(-28) and 1.61×10^(-28) m^3/hr, respectively. The hardness data shows that the peakaging of both two alloys were aging at 425℃ for 100 hours, and the peakaging hardness of Al-0.65Ti-3.22Zr and Al-1.74Ti-1.14Zr alloys were HV 75 and HV 78, respectively.

並列關鍵字

aluminum alloys ； rapid solidification ； precipitation ； coarsening rate ； hardness testing