【摘要】 利用热膨胀仪（DIL）、显微硬度计、电化学工作站、X射线衍射仪（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线光电子能谱（XPS）研究了Au₅₂Cu₂₇Ag_17-x(NiZn_0.5)_x （x=0,6,12）合金的热膨胀行为、显微硬度和电化学耐腐蚀性。随着x的增加,在热膨胀实验测试中合金的相对长度膨胀量和DIL曲线极大值的温度T_lm（即热稳定性）增加,这可以归因于原子结合能、错配熵的变化以及相变。增加x,合金的显微硬度可以得到提高,但是耐腐蚀性下降;此外,极化曲线的阳极电流峰密度随着x的增加而下降,这些结果与固溶度以及Ag、Ni、Zn合金元素在含Cl-离子溶液中的溶解密切相关。更多还原

【Abstract】 The thermal expansion behavior, microhardness and electrochemical corrosion resistance ofAu₅₂Cu₂₇Ag_17-x(NiZn_0.5)_x（x=0, 6 and 12） alloys were investigated by dilatometer（DIL）, microhardness tester, electrochemical workstation, X-ray diffractometer（XRD）, scanning electron microscopy（SEM）, transmission electron microscopy（TEM） and X-ray photoelectron spectroscopy（XPS）. With increasing x, the relative length expansion and DIL maximum temperature T_{l m}（i.e., thermal stability） of the alloys increase in thermal expansion measurements, which can be explained by the change of the atomic binding energy, mismatch entropy together with phase transformation. With the increase of x, the microhardness can be improved, but the corrosion resistance decreases; in addition, the anodic peak current densities of polarization curves decrease, which are related closely with the solid solution degree and dissolution of Ag, Ni and Zn alloying elements in Cl--containing solution.更多还原