Effect of Al addition on properties of Cu45Zr45.5Ti9.5 bulk metallic glass
Effect of Al addition on properties of Cu45Zr45.5Ti9.5 bulk metallic glass
复制标题
Al添加量对Cu45Zr45.5Ti9.5大块金属玻璃性能的影响
DOI：
10.1016/j.matchemphys.2020.123072
复制
发表时间：
2020
影响因子：
4.6
通讯作者：
Zhou G.J.
中科院分区：
文献类型：
--
作者：
Cai A.H.;Tan J.;Ding D.W.;Wang H.;Liu Y.;Wu H.;An Q.;Ning H.;Zhou G.J.
系统地研究了(Cu45Zr45.5Ti9.5)100-xAlx(x=0.25at%)玻璃形成合金的热性能、力学性能和腐蚀性能。热测试结果表明，Al微合金化导致玻璃化转变温度升高，但过冷液相区减小。玻璃化转变激活能随Al含量的增加先略有增大后减小。室温压缩试验表明，所有研究的铜基大块金属玻璃(BMG)都表现出加工硬化行为，但加工硬化能力取决于Al含量。此外，Al的加入显著提高了材料的屈服强度、断裂强度和断裂应变。(Cu45Zr45.5Ti9.5)99.8Al0.2BMG的最大塑性是无Al铜基BMG的6倍。此外，电化学测试表明，微量Al的加入降低了腐蚀电位和腐蚀电流密度。随着Al含量的增加，腐蚀行为逐渐由点蚀向自钝化转变。Al元素的局域非均质性被认为是导致所研究的铜基BMG性能变化的原因。这一结果将为微合金化对金属玻璃性能影响的机理提供新的见解。
The thermal, mechanical and corrosive properties of (Cu45Zr45.5Ti9.5)100-xAlx(x= 0–0.25 at%) glass forming alloys were systematically studied. The thermal measurements show that Al microalloying leads to increase of glass transition temperature but decrease of supercooled liquid region. The glass transition activation energy slightly increases and then decreases with increasing Al content. The room-temperature compression tests demonstrate that all studied Cu-based bulk metallic glasses (BMGs) exhibit work-hardening behavior, but the work-hardening capacity depends on Al content. In addition, yield strength, fracture strength and fracture strain are drastically increased by Al addition. The largest plasticity of (Cu45Zr45.5Ti9.5)99.8Al0.2BMG is 6 times larger than that of the Al-free Cu-based BMG. Moreover, the electrochemical measurements indicate that the Al minor addition cause the decrease of both corrosion potential and corrosion current density. The corrosion behavior gradually transforms from the pitting corrosion to the self-passivization with increasing Al content. The local heterogeneity of Al element is thought to be the reason for the performance change of the studied Cu-based BMGs. The present results would provide a new insight into the mechanism for the microalloying effect on the properties of the metallic glasses.