- 著者
-
土屋 大樹
牧田 悠暉
李 昇原
才川 清二
池野 進
松田 健二
- 出版者
- 一般社団法人 軽金属学会
- 雑誌
- 軽金属 (ISSN:04515994)
- 巻号頁・発行日
- vol.71, no.4, pp.166-170, 2021-04-15 (Released:2021-05-15)
- 参考文献数
- 18
Al-Si-Mg alloys have good castability and high strength can obtained by aging heat treatment. There are some reports about the age-hardening behavior of these alloys. However, the effect of additive elements on the age-hardening behavior with microstructure evolution in Al-Si-Mg alloys is not totally clarified yet. In the previous work, the effect of T5 heat treatment for age-hardening behavior and microstructure evolution in AC4C cast alloy were investigated. Fine rod-like precipitates which were reported in Al-Mg-Si alloy were observed near eutectic Si phase in AC4C alloy. Rod-like precipitates became coarser toward the center of α-Al dendrite. In this work, high purity AlSi-Mg alloys were fabricated, and the microstructure of the alloys in T5 condition was investigated by transmission electron microscopy (TEM). In Al-7%Si-0.4%Mg (mass%) alloy aged at 473K for 7.2ks, lots of needle-like precipitates, which were identified as β'' phase, were observed near the eutectic Si phase. On the other hand, rod-like precipitates and granular precipitates were observed far from the eutectic Si phase. Based on SAED patterns obtained from the rod-like precipitates and granular precipitates, Those precipitates were identified as Type-A precipitates and Si phase, respectively.