锆对铸造3104铝合金微观结构和力学性能的影响

Effect of Zr on microstructures and mechanical properties of as-cast Al- Mn-Fe 3104 alloy

摘要:

研究了不同锆添加量的3104合金的析出组织和力学性能。结果表明，随着Zr含量的增加，合金晶粒尺寸减小，当Zr质量分数大于或等于0.25%时，合金晶粒最小（20μm）。同时，晶粒形状由羽毛状变为等轴状。此外，Zr还可以通过形成Si相和其它金属间化合物来改善合金中Si和Mn元素的分布。维氏硬度分析表明，Zr的加入会降低Al-Mn-Fe 3104合金的硬度。此外，根据拉伸试验结果，当Zr质量分数不高于0.25%时，随着Zr含量的增加，合金的拉伸强度和延伸率都有所提高。适当的Zr含量可以起到钉扎位错和阻碍滑移的作用，提高合金的强度和韧性。

Abstract:

The precipitation microstructure and mechanical properties of as-cast 3104 alloys with different Zr additions was investigated. The results showed that the grain size of alloy decreases with the increase of Zr content, and it has the smallest grain (20μm) when the mass fraction of Zr (Zr wt%) was greater than or equal to 0.25%. Meanwhile, the grain shape changes from feathery to equiaxed. Furthermore, Zr can improve the distribution of Si and Mn elements in the alloy by forming Si phase and other intermetallic compounds. Vickers hardness analysis showed that the addition of Zr will reduce the hardness of Al-Mn-Fe 3104 alloy. Moreover, according to the results of tensile test, tensile strength and the elongation of the cast alloy are increase with Zr content increase until Zr wt% was 0.25%. The proper content of Zr plays a role of pinning dislocation and preventing slip, which improves strength and toughness of the alloys.