加入Al-5Ti-B细化剂和Al-2Zr-Sc中间合金后铝锌镁合金的组织和拉伸性能

发布时间：2019-04-25 19:51

【摘要】：在单独或复合添加Al-2Zr-Sc中间合金和Al-5Ti-B细化剂的条件下对铝锌镁合金进行细化处理,研究了不同细化条件下铸态铝镁锌合金的显微组织和力学性能。结果表明:单独加入质量分数为0.4%的Al-2Zr-Sc中间合金或Al-5Ti-B细化剂都可以细化铝镁锌合金的晶粒,且加入Al-2Zr-Sc中间合金后有Al3(Sc,Zr)相析出,提高了合金的抗拉强度;复合添加质量分数均为0.2%的Al-2Zr-Sc中间合金和Al-5Ti-B细化剂后,晶粒的细化效果最优,相比于基体合金,平均晶粒尺寸减小了20μm,抗拉强度提高了32%,这主要是细晶强化和析出强化共同作用的结果;晶界处长杆状第二相的存在导致复合细化合金的伸长率比单独细化合金的低。
[Abstract]:The Al-Zn-mg alloy was refined by adding Al-2Zr-Sc master alloy and Al-5Ti-B refiner, and the microstructure and mechanical properties of as-cast Al-mg-Zn alloy were studied under different refining conditions. The results show that the grain size of Al-mg-Zn alloy can be refined by adding 0.4% Al-2Zr-Sc master alloy or Al-5Ti-B refiner alone, and the Al3 (Sc,Zr) phase precipitates after adding Al-2Zr-Sc master alloy. The tensile strength of the alloy is improved. When 0.2% Al-2Zr-Sc master alloy and Al-5Ti-B refiner were added, the grain refinement effect was the best. Compared with the matrix alloy, the average grain size decreased by 20 渭 m and the tensile strength increased by 32%. This is mainly the result of the combination of fine grain strengthening and precipitation strengthening. The existence of the rod-like second phase of grain boundary leads to lower elongation of the composite refined alloy than that of the single refined alloy.
【作者单位】：河北工业大学材料科学与工程学院;天津大学材料科学与工程学院;中信戴卡轮毂制造有限公司;
【基金】：国家高技术研究发展计划(“863”计划)项目(2013AA031002)
【分类号】：TG146.21;TG292

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