Zr对2E12铝合金显微组织和力学性能的影响

来源期刊：中国有色金属学报2009年第2期

论文作者：王剑钊 王少华 房灿峰 杨守杰 戴圣龙 孟令刚 张兴国

文章页码：247 - 251

关键词：2E12铝合金；锆；电磁连铸；显微组织；力学性能

Key words：2E12 aluminum alloy; Zr; electromagnetic continuous casting; microstructure; mechanical properties

摘    要：研究Zr元素对2E12铝合金T4态显微组织及力学性能的影响。结果表明：添加质量分数0.3%的Zr元素可以细化合金的铸态组织，使晶粒平均尺寸从42 μm降低至30 μm左右，并促使晶粒等轴化；锻造过程中Zr可以抑制合金的再结晶，防止晶粒长大，改善2E12-T4态的显微组织，提高合金的力学性能，其抗拉强度、屈服强度、伸长率和断面收缩率分别提高5.4%、11.3%、9.7%和12.6%；合金的强化机理主要包括晶粒细化、颗粒弥散强化及形变强化。

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. σ_b, σ_0.2, 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.

基金信息：国家自然科学基金资助项目
国家重点基础研究计划资助项目