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在空气及水介质中对Mg-Gd-Y-Zn-Zr合金进行搅拌摩擦加工(FSP),分析了加工区的组织形貌特征，并研究了加工过程中不同冷却介质对加工区组织性能的影响。结果表明，空气中和水下FSP试样的平均晶粒尺寸分别为4和2μm。在空气中及水下FSP过程中，试样的大角度晶界比例提高，织构显著弱化。温度曲线表明：空气中FSP试样的持续热输入时间和冷却速率分别为49 s和8.5℃·s-1,水下FSP试样为23 s和30.7℃·s-1。由于水下FSP试样热输入的减少对再结晶过程的影响，其试样组织中的亚结构比例高于空气中FSP试样。同时，水下FSP试样保留了更多均匀分布的LPSO相。空气中FSP试样的屈服强度和抗拉强度分别为213和315 MPa,水下FSP试样分别为334和393 MPa。此外，所有FSP试样无力学性能各向异性。
Abstract：Mg-Gd-Y-Zn-Zr alloy was processed by friction stir processing(FSP) in air and water medium, the microstructure morphologies characteristics of the processing zones were analyzed and the effects of different cooling media on the structure properties of the processing zones were studied. The results show that the average grain sizes of the samples processed in air and underwater are 4 and 2 μm, respectively. In the process of FSP in air and underwater, the proportion of large angle grain boundary increases and the texture is weaken significantly. The temperature curves show that the duration heat input time and cooling rate of the FSP samples in air are 49 s and 8.5 ℃·s-1, respectively, and 23 s and 30.7 ℃·s-1 of FSP samples underwater, respectively. Due to the influence of the reduction of heat input for FSP samples underwater on the recrystallization process, the proportion of substructures of FSP samples underwater is higher than that of FSP samples in air. At the same time, more evenly distributed LPSO phases are retained in FSP samples underwater. The yield strength and tensile strength of FSP samples in air are 213 and 315 MPa, respectively, and 334 and 393 MPa of samples underwater, respectively. In addition, all FSP samples show no anisotropy of mechanical property.
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基本信息:
中图分类号:TG146.22
引用信息:
[1]关肖虎,王文,张婷,等.水下搅拌摩擦加工对Mg-Gd-Y-Zn-Zr合金微观组织和力学性能的影响[J],2023,30(01):191-199.
基金信息:
陕西省重点研发计划(2020ZDLGY13-06)