Effects of Sc and Zr microalloying on the microstructure and mechanical properties of high Cu content 7xxx Al alloy
来源期刊：International Journal of Minerals Metallurgy and Materials2019年第12期
论文作者：Chong-yu Liu Guang-biao Teng Zong-yi Ma Li-li Wei Bing Zhang Yong Chen
文章页码：1559 - 1569
摘 要：The effects of Sc and Zr microalloying on the microstructure and mechanical properties of a 7 xxx Al alloy with high Cu content（7055） during casting, deformation, and heat treatment were investigated. The addition of Sc and Zr not only refined the grains but also transformed the θ-phase into the W-phase in the 7055 alloy. Minor Sc and Zr additions enhanced the hardness and yield strength of the 7055-T6 alloy by strengthening the grain boundaries and Al3（Sc,Zr） precipitates. However, a further increase in the Sc and Zr fractions did not refine the grains but instead resulted in the formation of the large-sized W-phase and primary coarse Al3（Sc,Zr） phase and subsequently deteriorated the mechanical properties of the alloys. The 7055 alloy with 0.25 Sc addition exhibited the best mechanical property among the prepared alloys.
Chong-yu Liu1，Guang-biao Teng1,2，Zong-yi Ma3，Li-li Wei1，Bing Zhang4，Yong Chen1
1. College of Material Science and Engineering, Guilin University of Technology2. Guangdong JMA Aluminum Profile Factory (Group) Co., Ltd.3. Institute of Metal Research, Chinese Academy of Sciences4. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University
摘 要：The effects of Sc and Zr microalloying on the microstructure and mechanical properties of a 7 xxx Al alloy with high Cu content（7055） during casting, deformation, and heat treatment were investigated. The addition of Sc and Zr not only refined the grains but also transformed the θ-phase into the W-phase in the 7055 alloy. Minor Sc and Zr additions enhanced the hardness and yield strength of the 7055-T6 alloy by strengthening the grain boundaries and Al3（Sc,Zr） precipitates. However, a further increase in the Sc and Zr fractions did not refine the grains but instead resulted in the formation of the large-sized W-phase and primary coarse Al3（Sc,Zr） phase and subsequently deteriorated the mechanical properties of the alloys. The 7055 alloy with 0.25 Sc addition exhibited the best mechanical property among the prepared alloys.
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