Effect of mechanical tension on corrosive and thermal properties of Cu50Zr40Ti10 metallic glass
Effect of mechanical tension on corrosive and thermal properties of Cu50Zr40Ti10 metallic glass
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DOI：
10.1016/j.msea.2013.09.042
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发表时间：
2013-12
期刊：
影响因子：
6.4
通讯作者：
A. Cai;D. Ding;X. Xiong;Y. Liu;W. An;Zhou Guojun;Yun Luo;T. L. Li;Huiru Wang;Yuan Wu-Yuan-W
中科院分区：
文献类型：
--
作者：
A. Cai;D. Ding;X. Xiong;Y. Liu;W. An;Zhou Guojun;Yun Luo;T. L. Li;Huiru Wang;Yuan Wu-Yuan-W
采用熔融纺丝法制备Cu50Zr40Ti10（at%）玻璃带。采用差示扫描量热法和电化学极化实验研究了机械张力对其热性能和腐蚀性能的影响。机械拉伸后，结晶温度和结晶焓基本保持不变，松弛温度和玻璃化转变温度降低。此外，玻璃化转变的活化能从74.8±1.7 KJ mol−1降低到71.0±1.9 KJ mol−1。在低加热速率下，弛豫活化能从70.0±4.4 KJ mol−1减小到50.5±3.8 KJ mol−1，而在快速加热速率下，弛豫活化能从186.1±9.4 KJ mol−1增大到289.4±9.4 KJ mol−1。另一方面，腐蚀电位在所有溶液中极化后急剧下降，腐蚀电流密度增加。在1 M含氯化物溶液中，点蚀消失。在0.5 M H2SO4溶液中，无源电位和无源电流密度均降低。在所有研究溶液中，腐蚀表面显微照片都发生了显著变化。此外，还讨论了在0.5 M H2SO4、1 M HCl和1 M NaCl中腐蚀行为的差异。
Cu50Zr40Ti10(at%) glassy ribbon was prepared by melt spinning. The effect of mechanical tension on its thermal and corrosive properties was investigated by differential scanning calorimetry and electrochemical polarization experiments, respectively. After mechanical tension, the crystallization temperature and the crystallization enthalpy almost maintain the same, while the relaxation temperature and the glass transition temperature decrease. In addition, the activation energy of the glass transition decreases from 74.8±1.7 KJ mol−1to 71.0±1.9 KJ mol−1. The activation energy of the relaxation decreases from 70.0±4.4 KJ mol−1to 50.5±3.8 KJ mol−1at low heating rate, while increases from 186.1±9.4 KJ mol−1to 289.4±9.4 KJ mol−1at rapid heating rate. On the other hand, corrosion potentials polarized in all studied solutions sharply decrease, while the corrosion current densities increase. The pitting corrosion vanishes in 1 M chloride-containing solutions. The passive potential and the passive current density both decrease in 0.5 M H2SO4. The corroded surface micrographs in all studied solutions remarkably change. In addition, the difference of corrosive behavior in 0.5 M H2SO4, 1 M HCl, and 1 M NaCl is also discussed.