Plasticity improvement of ZrCu-based bulk metallic glass by ex situ dispersed Ta particles
Plasticity improvement of ZrCu-based bulk metallic glass by ex situ dispersed Ta particles
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DOI：
10.1016/j.msea.2011.08.006
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发表时间：
2011-10
期刊：
影响因子：
6.4
通讯作者：
J. Li;J. Jang;S. Jian;Kang-I Chen;Jen-Fu Lin;J. Huang
中科院分区：
文献类型：
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作者：
J. Li;J. Jang;S. Jian;Kang-I Chen;Jen-Fu Lin;J. Huang
采用真空吸铸法制备了（Zr 48Cu 36Al 8Ag 8）99.25Si 0.75基非晶复合材料（BMGC）棒材，并对棒材进行了表征。这些添加Ta的BMGCs与其基础合金对应物相比表现出类似的热性能，具有相对高的玻璃形成能力（GFA）。压缩试验结果表明，当ZrCu基BMGC的体积分数为10%时，直径为2 mm的棒料具有良好的上级力学性能，室温下压缩塑性应变可达22%，屈服强度和断裂强度分别为1800 MPa和1850 MPa钽粒子。这些非原位分散的Ta颗粒（20±8μm）将排列成半均匀的限制区，以限制剪切带的传播。此外，对于给定的Ta颗粒尺寸，较高体积分数的颗粒比较小体积分数的颗粒具有更大的界面面积、更短的颗粒间距和更小的约束区尺寸，从而表现出更大的压缩塑性。
The (Zr48Cu36Al8Ag8)99.25Si0.75-based bulk metallic glass composite (BMGC) rods ex situ dispersed with Ta particles (with a diameter of 2–4mm) have been successfully fabricated by suction casting and characterized. These Ta-added BMGCs exhibit similar thermal properties in comparison with its base alloy counterpart, with relatively high glass forming ability (GFA). The results of compression test show that a superior mechanical performance with up to 22% compressive plastic strain, 1800MPa yield strength and 1850MPa fracture strength at room temperature can be obtained for the 2mm diameter rod of the ZrCu-based BMGC with 10vol.% Ta particles. These ex situ dispersed Ta particles (20±8μm) would arrange as semi-uniform confinement zones to restrict the shear band propagation. In addition, for a given Ta particle size, higher volume fraction particles would lead to more interfacial areas, shorter inter-particle spacings, smaller confinement zone sizes than the smaller volume fraction particles, and results in presenting larger compression plasticity.