(1. 大連理工大學 鑄造中心，大連 116024；
2. 北京航空材料研究院，北京 100095)
摘 要: 研究Zr元素對2E12鋁合金T4態(tài)顯微組織及力學性能的影響。結(jié)果表明：添加質(zhì)量分數(shù)0.3%的Zr元素可以細化合金的鑄態(tài)組織，使晶粒平均尺寸從42 μm降低至30 μm左右，并促使晶粒等軸化；鍛造過程中Zr可以抑制合金的再結(jié)晶，防止晶粒長大，改善2E12-T4態(tài)的顯微組織，提高合金的力學性能，其抗拉強度、屈服強度、伸長率和斷面收縮率分別提高5.4%、11.3%、9.7%和12.6%；合金的強化機理主要包括晶粒細化、顆粒彌散強化及形變強化。
關(guān)鍵字: 2E12鋁合金；鋯；電磁連鑄；顯微組織；力學性能
2E12 aluminum alloy
DAI Sheng-long2, MENG Ling-gang1, ZHANG Xing-guo1
（1. Research Center of Foundry Engineering, Dalian University of Technology, Dalian 116024, China;
2. Beijing Institute of Aeronautical Materials, Beijing 100095, China）
Abstract: Effects of Zr on microstructures and mechanical properties of 2E12 aluminum alloy were studied. The results show that compared with 2E12 alloy the as-cast microstructures of alloy with 0.3% (mass fraction) Zr can be refined of grain sizes decreasing from 42 μm to 30 μm and characterized with equiaxed grains. Moreover, recrystallization during the forging process can be inhibited. σb, σ0.2, δ and ψ are improved with increasing Zr content, and the improving amplitudes reach 5.4%, 11.3%, 9.7% and 12.6%, respectively. Combined with the microstructures of alloys, the strengthening mechanism are mainly grain-refine, particles dispersion strengthening and improvement of deformation strengthening.
Key words: 2E12 aluminum alloy; Zr; electromagnetic continuous casting; microstructure; mechanical properties
