Mn对铸态ZA33合金组织及耐磨性的影响

Effects of Managnese Element on Microstructure and Wear Properties of As-cast ZA33 Alloy

研究了Mn合金化对铸态ZA33合金组织及性能的影响。结果表明:添加0.55%Mn元素后,ZA33合金组织细化效果最佳,α相由花朵状转变为蠕虫状晶粒,同时其力学性能也达到最优。适量Mn元素可改善ZA33合金的耐磨性,在高载荷下,耐磨效果提高的更加明显。Mn元素除少部分固溶在基体之外,大部分以富锰相的形式分布在晶间,不仅提高了合金基体强度,而且增加了合金硬质点的数量,从而提高了合金耐磨性。

The effects of Mn addition on the microstructure and properties of as-cast ZA33 alloys were investigated. The results show that the effects of refinement are the best when Mn is 0.55%, and α-Al phase converts from flower grain into vermicular grain, while the mechanical properties reach the optimal value. The wear resistance properties of ZA33 alloy improve by adding proper Mn, especially under the higher loads. Only a small portion of Mn element dissolves in matrix, most of them distribute at the grain boundary as rich-Mn phase, which can not only improve the matrix strength, but also increase the number of hard spots. As a result, the wear resistance of as-cast ZA33 alloys improves.