Zr与V对Al-4.6Mg-0.7Mn合金薄板组织与性能的影响

Effect of Zr and V on microstructure and properties of Al-4.6Mg-0.7Mn alloy sheet

采用高温拉伸试验,结合金相分析,研究了微量Zr、V元素对Al-4.6Mg-0.7Mn合金高温塑性的影响。结果表明,微量Zr和V均可以使试验合金组织更细小均匀,抑制高温变形过程中合金再结晶晶粒的长大,且V的作用效果更明显,从而提高合金的伸长率。含微量V的Al-4.6Mg-0.7Mn合金在510℃、.ε=3×10-3s-1条件下,其伸长率达到254%,应变速率敏感性指数m为0.48。

The effect of Zr and V on the high temperature ductility of Al-4.6Mg-0.7Mn aluminum alloy sheets has been investigated by using of high temperature tensile stretch and optical microscopy analysis. The results show that mini-contents of Zr and V adding into testing alloy can make the structure of the sheets more fine and even, and can restrain the grain growth during re-crystallization at high temperature deformation ; the effect of V on crystal-re- fining and grain-growth restraining is even stronger. Therefore the elongation of the alloy sheet can be increased. Mini-content of V in A1-4.6Mg-0.7Mn aluminum alloy can make the elon- gation reach to 254% at condition of S10℃,ε =3 ×10^-3 s^-1 ,and the strain rate sensitivity m can be 0.48.