Composition design and properties of Cu-Zr-Ti bulk metallic glass composites
Composition design and properties of Cu-Zr-Ti bulk metallic glass composites
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Cu-Zr-Ti块体金属玻璃复合材料的成分设计及性能
DOI：
10.1016/j.matchemphys.2019.05.030
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发表时间：
2019
影响因子：
4.6
通讯作者：
Peng Y Y
中科院分区：
文献类型：
--
作者：
Feng Yanjiao;Cai A H;Ding D W;Liu Y;Wu H;An Qi;Ning H;Zhou G J;Peng Y Y
采用Cu50Zr50和Cu73Ti27二元合金的比例混合设计了（Cu50Zr50）x(Cu73Ti27)100-x（x= 0.63-0.75 at.%）合金。系统地研究了它们的热性能、机械性能和腐蚀性能以及玻璃化成形能力。结果表明：所研究的cu基玻璃成形合金是具有非共晶成分的大块金属玻璃复合材料，具有加工硬化行为；当 ≥0.74 at%时，玻璃化转变温度和还原玻璃化转变温度先升高后降低，而临界冷却速率和过冷液区则相反。当x≤ 0.71 at%时，屈服强度和断裂强度均先增大后减小。（Cu50Zr50）0.75(Cu73Ti27)0.25BMGC的塑性应变最大。动电位极化测量表明，所研究的bmgc均表现出阶梯状的阳极极化行为，表明了点蚀和自钝化两个竞争过程。随着x的减小，腐蚀行为逐渐由主要的自钝化转变为点蚀。（Cu50Zr50）0.75(Cu73Ti27)0.25BMGCs的腐蚀电流密度和起始无源电流密度都比其他cu基BMGCs低两个数量级。讨论了GFA和腐蚀的机理。本文的工作将为如何设计和开发具有优良综合性能的BMGCs提供启示。
(Cu50Zr50)x(Cu73Ti27)100-x(x= 0.63–0.75 at.%) alloys are designed using the proportional mixing of Cu50Zr50and Cu73Ti27binary alloys. Their thermal, mechanical and corrosive properties as well as the glass forming ability (GFA) are systematically investigated. The results show that the studied Cu-based glass forming alloys are bulk metallic glass composites (BMGCs) with off-eutectic compositions and display work-hardening behavior. The glass transition temperature and the reduced glass transition temperature increase and then decrease with increasingxwhenx ≥0.74 at%, while on the contrary for the critical cooling rate and supercooled liquid region. Both yield strength and fracture strength firstly increase and then decrease with decreasingxwhenx≤ 0.71 at%. The plastic strain of (Cu50Zr50)0.75(Cu73Ti27)0.25BMGC is the largest among the studied Cu-based BMGCs. Potentiodynamic polarization measurements show that all studied BMGCs exhibit a step-like anodic polarization behavior, indicating two competitive procedures of pitting corrosion and self-passivization. The corrosion behavior gradually transforms from predominant self-passivization to the pitting corrosion with decreasingx. Both corrosion current density and onset passive current density of (Cu50Zr50)0.75(Cu73Ti27)0.25BMGCs are two orders of magnitude lower than those of the other Cu-based BMGCs. The mechanisms for the GFA and the corrosion are also discussed. The present work would shed light on how to design and develop BMGCs with superior comprehensive performances.