半固態(tài)ZCuSn10銅合金坯料單向壓縮變形行為及顯微組織Deformation behavior and microstructure of semi-solid ZCuSn10 copper alloy billet during uniaxial compression

采用Gleeble-1500材料熱/力模擬機，對應(yīng)變誘導(dǎo)熔化激活法(SIMA)制備的不同原始半固態(tài)組織的ZCuSn10銅合金進行單向壓縮實驗。研究預(yù)變形量和壓縮變形條件對半固態(tài)坯料真應(yīng)力-應(yīng)變曲線及其組織的影響，并結(jié)合ZCuSn10銅合金壓縮后的宏觀形貌和顯微組織對液相的流動規(guī)律進行分析。結(jié)果表明：隨著預(yù)變形量和變形溫度的增加，流變應(yīng)力降低。變形溫度對半固態(tài)ZCuSn10銅合金壓縮變形峰值應(yīng)力影響較大，對穩(wěn)態(tài)應(yīng)力影響較小。與固態(tài)金屬壓縮變形相同，半固態(tài)ZCuSn10銅合金在半固態(tài)溫度區(qū)間壓縮變形時，存在3個典型壓縮變形區(qū)域，即難變形區(qū)(Ⅰ區(qū))、大變形區(qū)(Ⅱ區(qū))、自由變形區(qū)(Ⅲ區(qū))，Ⅰ、Ⅱ、Ⅲ區(qū)的液相率分別為15.23%、5.31%、20.12%。各個變形區(qū)之間發(fā)生了液相流動，小部分難變形區(qū)內(nèi)的液相流到大變形區(qū)，大部分大變形區(qū)內(nèi)的液相流到自由變形區(qū)。

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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