论文部分内容阅读
采用金相组织观察、扫描电镜、拉伸性能测试等手段,研究了挤压铸造Al-5.0Cu-0.8Mg-0.5Fe合金的组织演变和力学性能。结果表明,当挤压压力从0增大到75 MPa时,合金的力学性能得到显著提高,这主要是由于挤压压力有利于Al-Cu合金中汉字状AlmFe相的形成,抑制针状β-Fe相的形成,同时显著细化富Fe相,减少铸造缺陷。当挤压压力为75MPa时,铸态下合金抗拉强度为258 MPa,伸长率为8.5%,经T6热处理后,其抗拉强度为432 MPa,伸长率为6.7%。
Microstructure evolution and mechanical properties of squeeze cast Al-5.0Cu-0.8Mg-0.5Fe alloy were investigated by means of metallographic observation, scanning electron microscopy and tensile testing. The results show that when the extrusion pressure is increased from 0 to 75 MPa, the mechanical properties of the alloy are significantly enhanced, which is mainly due to the extrusion pressure is conducive to Al-Cu alloy AlkFe Chinese character formation, inhibition of acicular β- Fe phase formation, while significantly refining the Fe-rich phase, reducing casting defects. When the extrusion pressure is 75MPa, the tensile strength of as-cast alloy is 258 MPa and the elongation is 8.5%. After T6 heat treatment, the tensile strength is 432 MPa and the elongation is 6.7%.