Effects of Ti Addition on Microstructure and Tensile Property of Zn-Al-Cu-Mg-RE Alloy
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摘要: 研究了钛加入量(质量分数分别为0.08%, 0.12%, 0.16%)对离心铸造法制备锌铝铜镁稀土合金显微组织和拉伸性能的影响。结果表明: 先析出的η-Zn相以钛作异质形核点形核长大, 钛的加入改变了锌铝铜镁稀土合金的凝固方式, 钛还与铝形成Al2Ti和Al1+xTi1-x相, 分布在晶界上, 抑制了共晶组织的生成; 随钛加入量增大, 合金的抗拉强度先降后升再降, 而伸长率先升后降, 当钛加入量为0.12%时, 抗拉强度从310 MPa降到285 MPa, 但伸长率从加入前的4%提高到7%, 提高了75%。Abstract: The effects of titanium addition (0.08wt.%, 0.12wt.%, 0.16wt.%)on microstructure and tensile property of Zn-Al-Cu-Mg-RE alloy that prepared by centrifugal casting were studied. The results show that the prior precipitation η-Zn promoted by Ti as heterogeneous nucleation points nucleated and grew up. The addition of Ti changed the solidification mode of Zn-Al-Cu-Mg-RE alloys, meanwhile Al2Ti and Al1+xTi1-x which distributed in grain boundary and restrained grain growth were formed by Ti and Al. The tensile strength of alloy experienced fell, rose and fell, and the elongation rose and then fell with the increase of Ti addition. When Ti addition reached to 0.12% , the tensile strength decreased slightly from 310 MPa to 285 MPa, but the elongation improved from 4% to 7%, increasing by 75%.
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Keywords:
- titanium /
- Zn-Al-Cu-Mg-RE alloy /
- centrifugal casting /
- microstructure /
- tensile property
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