Plasticity enhancement of Mg58Cu28.5Gd11Ag2.5 based bulk metallic glass composites dispersion strengthened by Ti particles
Plasticity enhancement of Mg58Cu28.5Gd11Ag2.5 based bulk metallic glass composites dispersion strengthened by Ti particles
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DOI：
10.1016/j.jallcom.2010.03.030
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发表时间：
2010-08
影响因子：
6.2
通讯作者：
J. Jang;Y. Chang;T. H. Li;P. Hsieh;J. Huang;C. Tsao
中科院分区：
文献类型：
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作者：
J. Jang;Y. Chang;T. H. Li;P. Hsieh;J. Huang;C. Tsao
在Ar气氛下，采用注射铸造法成功地制备了直径为2- 4 mm的Ti颗粒增强Mg_（58）Cu_（28.5）Gd_（11）Ag_（2.5）金属玻璃复合材料（BMGCs）棒材。系统地研究了Ti颗粒体积分数（Vf）对Mg基BMGCs非晶形成能力（GFA）和力学性能的影响。结果表明，随着Ti颗粒体积分数的增加，合金的压缩塑性提高。当镁基BMGC的体积分数为40%时，其压缩塑性应变最高可达24钛颗粒。同时，压缩试验后，在样品表面上显示出多个剪切带。这表明，弥散分布的Ti颗粒能有效地吸收剪切带的能量，并将主剪切带分支为多个剪切带，从而降低了剪切带进一步扩展的应力集中，显著提高了塑性。当Ti颗粒的加入量增加到40 vol.%时，屈服强度仍保持在800 MPa。这可能是由于Ti颗粒与非晶基体界面结合良好所致。
We have successfully synthesized the Ti particles reinforced Mg58Cu28.5Gd11Ag2.5metallic glass composites (BMGCs) rods with a diameter of 2–4mm by injection casting method in an Ar atmosphere. The glass forming ability (GFA) and the mechanical properties of these Mg-based BMGCs have been systematically investigated as a function of volume fraction (Vf) of Ti particles. The results show that the compressive plasticity increases with the volume fraction of Ti particles. A drastic improvement of compressive plastic strain (reach up to 24%) occurs at the Mg-based BMGC with 40vol.% Ti particles. In parallel, multiple shear bands were revealed on the sample surface after compression test. This suggests that these dispersed Ti particles can highly absorb the energy of shear banding and branch the primary shear band into multiple shear bands, thus decrease the stress concentration for further propagation of shear band and so as to significantly enhance plasticity. Additionally, the yield strength can be kept at 800MPa as increasing the addition of Ti particles to 40vol.%. This was found presumably due to the good bonding of interface between the Ti particle and amorphous matrix.