Effect of Different Titanium Alloying Methods on the Grain Refinement and Mechanical Properties of ZA46 Alloy

摘要:

研究了3种加钛方式（添加低钛铝合金，铝钛中间合金和氟盐）对Zn-Al合金组织及性能的影响。结果表明，铸造过程中添加钛能有效地细化Zn-Al合金组织，其中低钛铝合金的细化效果最好。分析认为，其原因可能是由于在强大电磁场的搅拌作用下，Ti原子的均匀分布以及原位析出的异质形核质点的形核作用所致。由于晶粒的细化，增加了晶界面积，更有效地抑制了位错的通过，从而增强了基体的结合力。因而电解添加低钛铝合金的Zn-Al合金具有最高的力学性能和耐摩擦磨损性能

Abstract:

Three kinds of titanium alloying methods including low-titanium aluminum alloy addition, aluminum-titanium master alloy addition and villiaumite addition were chosen. The influences of titanium alloying methods on the microstructure and the mechanical property of Zn-Al alloy were studied. The test results show that it is effective for grain refining of Zn-Al alloy by adding titanium to the melt before casting. The low-titanium alloys addition is the most effective for grain refining of the Zn-Al alloy. The reason might be attributed to that the titanium atoms evenly spread to the whole melt rapidly under stirring action of electromagnetic field and, the better capacity of the heterogeneous nucleation of in-situ precipitating heterogeneous nucleation sites. The finer grain size increases the grain boundary areas and it causes that the grain boundary has better ability to prohibit dislocation passing through. Thus, the binding ability of the base is strengthened. The test alloy added by low-titanium aluminum alloy shows the highest tensile properties and wear resistance