半固态ZCuSn10铜合金坯料单向压缩变形行为及显微组织Deformation behavior and microstructure of semi-solid ZCuSn10 copper alloy billet during uniaxial compression

采用Gleeble-1500材料热/力模拟机，对应变诱导熔化激活法(SIMA)制备的不同原始半固态组织的ZCuSn10铜合金进行单向压缩实验。研究预变形量和压缩变形条件对半固态坯料真应力-应变曲线及其组织的影响，并结合ZCuSn10铜合金压缩后的宏观形貌和显微组织对液相的流动规律进行分析。结果表明：随着预变形量和变形温度的增加，流变应力降低。变形温度对半固态ZCuSn10铜合金压缩变形峰值应力影响较大，对稳态应力影响较小。与固态金属压缩变形相同，半固态ZCuSn10铜合金在半固态温度区间压缩变形时，存在3个典型压缩变形区域，即难变形区(Ⅰ区)、大变形区(Ⅱ区)、自由变形区(Ⅲ区)，Ⅰ、Ⅱ、Ⅲ区的液相率分别为15.23%、5.31%、20.12%。各个变形区之间发生了液相流动，小部分难变形区内的液相流到大变形区，大部分大变形区内的液相流到自由变形区。

The uniaxial compressive deformation experiments on ZCuSn10 copper alloy billet with different original semi-solid organizations prepared by strain induced melt activation (SIMA) process were carried out using Gleeble-1500 thermo-mechanical simulator. The effect of pre-deformation and compressive deformation conditions on true strain–stress curves and organizations of semi-solid billet were analyzed. And the liquid flowing law was studied by analyzing the macroscopic morphology and microstructure of ZCuSn10 copper alloy after the compression. The results show that deformation resistance reduces with increasing the pre-deformation amount and deformation temperature. The deformation temperature of uniaxial compression has a greater impact on the peak stress of semi-solid ZCuSn10 copper alloy during uniaxial compression, but has a less impact on steady stress. As same as the compressive deformation of solid metal, there are three typical compression areas in semi-solid ZCuSn10 copper alloy during uniaxial compression, namely difficult deformation zone (zone Ⅰ), large deformation zone (zone Ⅱ)and free deformation zone (zone Ⅲ). The contents of liquid phase in zones Ⅰ, Ⅱ and Ⅲ are 15.23%, 5.31% and 20.12%, respectively. And the liquid phase flowing occurs among different deformation zones, a small amount of liquid phase in the difficult deformation zone flows to the large degree deformation zone, and a large amount of liquid phase in the large degree deformation zone flows to the free deformation zone.

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