利用CALPHAD(calculation of phase diagrams)技术和已有热力学数据,通过对比分析亚稳过冷液态合金中各结晶相的形核驱动力大小,寻找结晶能力弱而非晶形成能力强的成分范围.选择典型的非晶形成体系,以平衡卡相图中共晶深度明显不同的3...利用CALPHAD(calculation of phase diagrams)技术和已有热力学数据,通过对比分析亚稳过冷液态合金中各结晶相的形核驱动力大小,寻找结晶能力弱而非晶形成能力强的成分范围.选择典型的非晶形成体系,以平衡卡相图中共晶深度明显不同的3个二元合金体系Cu-Zr,Ni-Nb和Pd-Si为研究对象,预测各体系非晶形成能力与成分的关系,获得非品形成最优成分,并与共晶点成分及实验数据进行对比.预测结果与实验确定的块体非晶最优成分相符.展开更多
Electrical resistivity and viscosity of Pb–Sb alloys are measured to investigate Peierls distortion behavior in the melts. In Pb30Sb70, Pb20Sb80, and Pb10Sb90 melts, temperature dependence of resistivity deviates fro...Electrical resistivity and viscosity of Pb–Sb alloys are measured to investigate Peierls distortion behavior in the melts. In Pb30Sb70, Pb20Sb80, and Pb10Sb90 melts, temperature dependence of resistivity deviates from linear dependence during cooling. At 663 °C, different trends in isothermal behavior between experimental and theoretical resistivities, are interpreted as the existence of Peierls distortion in Sb-rich melts. In Pb30Sb70 and Pb20Sb80 melts, abnormal viscosity results verify the existence of abnormal structure transition, which is attributed to the formation of large Sb clusters with Peierls distortion. In undercooled liquid Pb20Sb80, minute resistivity coefficient and quadratic resistivity behavior are interpreted as the rapid increase of cluster size of Sb clusters with Peierls distortion, which provides preferential nucleation sites for higher structure similarity to the crystalline and lower liquid–solid interfacial energy.展开更多
文摘利用CALPHAD(calculation of phase diagrams)技术和已有热力学数据,通过对比分析亚稳过冷液态合金中各结晶相的形核驱动力大小,寻找结晶能力弱而非晶形成能力强的成分范围.选择典型的非晶形成体系,以平衡卡相图中共晶深度明显不同的3个二元合金体系Cu-Zr,Ni-Nb和Pd-Si为研究对象,预测各体系非晶形成能力与成分的关系,获得非品形成最优成分,并与共晶点成分及实验数据进行对比.预测结果与实验确定的块体非晶最优成分相符.
基金Project (50971083) supported by the National Natural Science Foundation of China
文摘Electrical resistivity and viscosity of Pb–Sb alloys are measured to investigate Peierls distortion behavior in the melts. In Pb30Sb70, Pb20Sb80, and Pb10Sb90 melts, temperature dependence of resistivity deviates from linear dependence during cooling. At 663 °C, different trends in isothermal behavior between experimental and theoretical resistivities, are interpreted as the existence of Peierls distortion in Sb-rich melts. In Pb30Sb70 and Pb20Sb80 melts, abnormal viscosity results verify the existence of abnormal structure transition, which is attributed to the formation of large Sb clusters with Peierls distortion. In undercooled liquid Pb20Sb80, minute resistivity coefficient and quadratic resistivity behavior are interpreted as the rapid increase of cluster size of Sb clusters with Peierls distortion, which provides preferential nucleation sites for higher structure similarity to the crystalline and lower liquid–solid interfacial energy.
