Cai Anhui, Ding Dawei, Liu Yong, Wu Hong, An Weike, Zhou Guojun, Luo Yun, Peng Yongyi
College of Mechanical Engineering, Hunan Institute of Science and Technology, Yueyang 414000, China.
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China.
Materials (Basel). 2016 May 25;9(6):408. doi: 10.3390/ma9060408.
A group of plastic Zr-Al-Ni-Cu bulk metallic glasses (BMGs) with low Zr content was developed and their thermal and mechanical properties were investigated. The results show that these Zr-based BMGs have a single crystallization event for all heating rates in the studied temperature region. The glass transition temperature decreases with increasing Zr content for all heating rates. There are two melting procedures for the BMGs whose Zr content is less than 52 at %, while three melting procedures for the other Zr-based BMGs. The second melting procedure is split into two melting procedures for ZrAlNiCu and ZrAlNiCu BMGs, while the first melting procedure is split into two melting procedures for the other BMGs. The activation energy decreases with increasing sensitivity index β for the studied Zr-based BMGs. The plastic strain ε is in the region of 0.2%-19.1% for these Zr-based BMGs. Both yield strength σ and fracture strength σ are smallest for ZrAlNiCu BMG whose ε is largest among all studied Zr-based BMGs and reaches up to 19.1%. In addition, the mechanism for the large difference of the plasticity among the studied Zr-based BMGs is also discussed.
开发了一组低Zr含量的塑性Zr-Al-Ni-Cu块状金属玻璃（BMG），并研究了它们的热性能和力学性能。结果表明，这些基于Zr的BMG在研究温度范围内的所有加热速率下都有一个结晶事件。对于所有加热速率，玻璃化转变温度随Zr含量的增加而降低。Zr含量小于52 at%的BMG有两个熔化过程，而其他基于Zr的BMG有三个熔化过程。对于ZrAlNiCu和ZrAlNiCu BMG，第二个熔化过程分为两个熔化过程，而对于其他BMG，第一个熔化过程分为两个熔化过程。对于所研究的基于Zr的BMG，激活能随灵敏度指数β的增加而降低。这些基于Zr的BMG的塑性应变ε在0.2%-19.1%范围内。在所有研究的基于Zr的BMG中，ZrAlNiCu BMG的ε最大，达到19.1%，其屈服强度σ和断裂强度σ最小。此外，还讨论了所研究的基于Zr的BMG之间塑性差异较大的机制。
