锶、钛对稀土改性压铸AZ91合金组织与性能的影响

于丹; 田政; 邵军; 敖四海; 孟健

doi:10.15980/j.tzzz.2020.02.003

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锶、钛对稀土改性压铸AZ91合金组织与性能的影响
Effects of Sr and Ti on Microstructure and Properties of Die-casting RE Modified AZ91 Alloy
2020年40卷第2期页码：130-134
纸质出版日期： 2020 ，
DOI： 10.15980/j.tzzz.2020.02.003

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[1]于丹,田政,邵军,敖四海,孟健.锶、钛对稀土改性压铸AZ91合金组织与性能的影响[J].特种铸造及有色合金,2020,40(02):130-134.

Yu Dan, Tian Zheng, Shao Jun, et al. Effects of Sr and Ti on Microstructure and Properties of Die-casting RE Modified AZ91 Alloy[J]. Special Casting & Nonferrous Alloys, 2020,40(2):130-134.
[1]于丹,田政,邵军,敖四海,孟健.锶、钛对稀土改性压铸AZ91合金组织与性能的影响[J].特种铸造及有色合金,2020,40(02):130-134. DOI： 10.15980/j.tzzz.2020.02.003.

Yu Dan, Tian Zheng, Shao Jun, et al. Effects of Sr and Ti on Microstructure and Properties of Die-casting RE Modified AZ91 Alloy[J]. Special Casting & Nonferrous Alloys, 2020,40(2):130-134. DOI： 10.15980/j.tzzz.2020.02.003.

摘要

研究了微量Sr、Ti对压铸AZ91合金微观组织与性能的影响。结果发现

与AZ91镁合金相比

添加稀土后

合金的强度提升、塑性下降。进一步添加Sr后

合金因组织细化而使塑性提升

但强度及耐腐蚀性降低。进一步添加Ti元素

则抑制了Sr元素的不利影响

并使合金保持良好的塑性。通过多元微合金化的方法使AZ91+RE+Sr+Ti合金达到最佳的综合性能。微观组织随组分添加而发生演变是材料性能变化的主要原因。

Abstract

The effects of Sr and Ti on microstructure and properties of the die-casting rare earth modified AZ91 magnesium alloy were investigated.Through compared with that of AZ91 alloy

the strength of AZ91+RE alloy is increased with the decrease of elongation.After further adding Sr

plasticity of the alloy is improved due to refinement effect

while the strength and corrosion resistance of the modified alloy are decreased.The addition of Ti can inhibit the adverse effect of Sr and remain good plasticity.The AZ91+RE+Sr+Ti alloy has the desirable comprehensive properties by multi-element microalloying.The evolution of microstructure with the addition of components is responsible for the change of material properties.