Effects of casting current on structure and properties of a nanostructured Zr-Cu-Fe-Al bulk metallic glass
Effects of casting current on structure and properties of a nanostructured Zr-Cu-Fe-Al bulk metallic glass
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铸造电流对纳米Zr-Cu-Fe-Al块体金属玻璃结构与性能的影响
DOI：
10.1007/s42243-018-0092-5
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发表时间：
2018
影响因子：
2.5
通讯作者：
Lan Si
中科院分区：
文献类型：
--
作者：
Liu Si-nan;Dong Wei-xia;Lu Chen-yu;Lu Zhu-wei;Ge Jia-cheng;Yuan Chen-chen;Sun Bao-an;Feng Tao;Wang Xun-li;Lan Si
研究了铸造电流对两种Zr基块体非晶合金的热物理行为、原子结构和纳米结构以及力学性能的影响，采用差示扫描量热法、广角X射线衍射、小角X射线散射和压缩实验对Zr 59 Cu 33 Al 8和Zr 59（Cu0.55Fe0.45）33 Al 8进行了研究。可以调节铸造电流以改变铸造初始温度。结果表明，Zr 59 Cu 33 Al 8合金在不同铸造电流下冷却时，晶化前的熔体结构没有发生异常变化。相比之下，液态相分离被认为发生在Zr 59（Cu 0. 55 Fe 0. 45）33 Al 8熔融液体中使用较低的铸造电流制备结晶之前在冷却过程中。Zr 59（Cu0.55Fe0.45）33 Al 8衍射图第一个尖锐衍射峰的位置偏移表明，在不同的铸造电流下冷却时，熔融液的密度可能会降低。小角X射线散射结果表明，随着铸造温度的降低，Zr 59（Cu 0. 55 Fe 0. 45）33 Al 8非晶合金的不均匀性增加。结果，具有液态相分离的金属玻璃具有更好的机械性能，包括更高的屈服应力和更显著的压缩延展性。纳米级液相分离及其与剪切带的相互作用导致Zr-Cu-Fe-Al大块非晶合金的非均匀性增加，是其力学性能增强的原因。
The effects of casting currents on the thermophysical behaviors, atomic and nanoscale structure, and mechanical properties of two Zr-based-bulk metallic glasses, i.e., Zr59Cu33Al8and Zr59(Cu0.55Fe0.45)33Al8, were studied by using differential scanning calorimetry, wide-angle X-ray diffraction, and small-angle X-ray scattering, as well as compression tests. The casting currents can be tuned to change the casting initiative temperature. Results revealed that there is no anomalous structural change for the Zr59Cu33Al8molten liquid before crystallization during cooling with different casting currents. In contrast, liquid-state phase separation was suggested to occur in the Zr59(Cu0.55Fe0.45)33Al8molten liquid prepared using lower casting current before crystallization during cooling. The position shift of the first sharp diffraction peak for the diffraction pattern of Zr59(Cu0.55Fe0.45)33Al8shows that the density of the molten liquid may decrease upon cooling at different casting currents. The small-angle X-ray scattering results indicate that the heterogeneity of the Zr59(Cu0.55Fe0.45)33Al8metallic glasses increases with decreasing the casting temperature. As a result, the metallic glasses with a liquid-state phase separation possess better mechanical properties, including higher-yielding stress and more significant compressive ductility. The increase in degree of heterogeneity formed by nanoscale liquid-state phase separation and their interactions with the shear bands for the Zr–Cu–Fe–Al bulk metallic glasses were suggested to be responsible for the enhanced mechanical properties.