低压脉冲磁场对Al-12.4Si合金组织与力学性能的影响

Effects of Low Voltage Pulsed Magnetic Field(LVPMF)on Microstructure and Mechanical Properties of Al-12.4Si Alloy

在Al-12.4Si合金的凝固过程中施加低压脉冲磁场处理,研究了低压脉冲磁场对Al-12.4Si合金凝固组织和力学性能的影响。结果表明,在低压脉冲磁场的作用下,Al-12.4Si合金凝固组织中的初生α-Al相和共晶Si相均得到明显细化。随着放电电压的增加,共晶Si相由粗大的长针状转变为细小的纤维状和颗粒状。施加低压脉冲磁场处理后,Al-12.4Si合金的抗拉强度达到了187MPa,伸长率达到了5.2%。相比未施加磁场处理的合金,抗拉强度和伸长率分别提高了41.7%和173.7%。

Effects of LVPMF on microstructure and mechanical properties of Al-12.4Si alloy were investigated by introducing a low voltage pulsed magnetic field(LVPMF)during solidification.The results show that the primaryα-Al and eutectic silicon in the Al-12.4Si alloy are refined by LVPMF treatment.With the increase the voltage of LVPMF,eutectic Si phase is transformed from acicular structure into fine fibrous or granular ones.Meanwhile,the tensile strength and elongation of Al-12.4Si alloy under LVPMF at room temperature reach up to 187 MPa and 5.2%,respectively,which are increased by41.7%and by 173.7%,respectively,compared with those of the eutectic Al-Si alloy without LVPMF treatment.