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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials >Extrusion formability and deformation behavior of Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(22.5) bulk metallic glass in an undercooled liquid state after rapid heating
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Extrusion formability and deformation behavior of Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(22.5) bulk metallic glass in an undercooled liquid state after rapid heating

机译：快速加热后过冷液态Zr_（41.2）Ti_（13.8）Cu_（12.5）Ni_（10）Be_（22.5）大块金属玻璃的挤压成形性和变形行为

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摘要

Deformation behavior of a Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(22.5) bulk metallic glass (BMG) has been investigated under compressive loading after rapid heating to an undercooled liquid state. A homogeneous plastic flow has been observed at the intermediate initial strain rate and temperature range of undercooled liquid state. In this homogeneous flow regime, the Newtonian flow was observed to become a non-Newtonian flow as the temperature at a given strain rate was decreased. An empirical deformation map could be constructed from the result of compression tests to provide the boundary between the Newtonian and non-Newtonian flow regimes in terms of strain rates and test temperatures. Considering the efficiency of power dissipation and instability condition based on the dynamic materials model (DMM), a processing map could also be constructed. The macroscopic formability of this BMG alloy has also been examined through an extrusion test in a laboratory scale within undercooled liquid state. From the results of macroscopic extrusion formability test, both the deformation map and processing map are found to present an adequate optimal forming condition.
机译：研究了Zr_（41.2）Ti_（13.8）Cu_（12.5）Ni_（10）Be_（22.5）大块金属玻璃（BMG）在快速加热至过冷液态后的压缩载荷下的变形行为。在过冷液态的中间初始应变速率和温度范围内，观察到均匀的塑性流动。在这种均匀流动状态下，随着给定应变速率下温度的降低，观察到牛顿流变为非牛顿流。可以从压缩测试的结果构建经验变形图，以根据应变率和测试温度在牛顿流态和非牛顿流态之间提供边界。考虑基于动态材料模型（DMM）的功耗效率和不稳定性条件，还可以构建处理图。该BMG合金的宏观可成形性也已通过在实验室规模下在过冷液态下的挤压试验进行了检验。从宏观挤压成形性测试的结果来看，变形图和加工图都显示出适当的最佳成形条件。

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