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Experimental Phase Equilibria and Isopleth Section of 8Nb-TiAl Alloys
Metals ( IF 2.9 ) Pub Date : 2021-08-01 , DOI: 10.3390/met11081229 Yong Xu , Yongfeng Liang , Lin Song , Guojian Hao , Bin Tian , Rongfu Xu , Junpin Lin
Metals ( IF 2.9 ) Pub Date : 2021-08-01 , DOI: 10.3390/met11081229 Yong Xu , Yongfeng Liang , Lin Song , Guojian Hao , Bin Tian , Rongfu Xu , Junpin Lin
The 8Nb isopleth section of a Ti-Al-Nb system is experimentally determined based on thermal analysis and thermodynamic calculation methods to obtain the phase transformation and equilibrium relations required for material design and fabrication. The phase transus and relations for the 8Nb-TiAl system show some deviations from the calculated thermodynamic results. The ordered βo phase transforms from the disordered β/α phases at 1200–1400 °C over a large Al concentration range, and this transformation is considered to be an intermediate type between the first- and second-order phase transitions. Moreover, the βo phases are retained at the ambient temperature in the 8Nb-TiAl microstructures. The ωo phase transforms from the highly ordered βo phase, rather than from α2 or βo with a low degree of atom ordering B2 (LOB2) structure, with Al concentration of 32–43 at% at approximately 850 °C. From the experimental detection, the transition of the ωo phase from the βo phase is considered to be a further ordering process.
中文翻译:
8Nb-TiAl合金的实验相平衡和等压截面
Ti-Al-Nb 系统的 8Nb 等值线截面是基于热分析和热力学计算方法通过实验确定的,以获得材料设计和制造所需的相变和平衡关系。8Nb-TiAl 系统的相变和关系显示与计算的热力学结果存在一些偏差。有序的 β o相在 1200-1400 °C 下在大的 Al 浓度范围内从无序的 β/α 相转变,这种转变被认为是一级和二级相变之间的中间类型。此外,β o相在环境温度下保留在 8Nb-TiAl 微结构中。ω o相从高度有序的 β o转变而来相,而不是来自具有低原子有序度 B2 (LOB2) 结构的α 2或 β o,Al 浓度在大约 850 °C 时为 32–43 at%。从实验检测来看,ω o相从β o相的转变被认为是一个进一步的排序过程。
更新日期:2021-08-02
中文翻译:
8Nb-TiAl合金的实验相平衡和等压截面
Ti-Al-Nb 系统的 8Nb 等值线截面是基于热分析和热力学计算方法通过实验确定的,以获得材料设计和制造所需的相变和平衡关系。8Nb-TiAl 系统的相变和关系显示与计算的热力学结果存在一些偏差。有序的 β o相在 1200-1400 °C 下在大的 Al 浓度范围内从无序的 β/α 相转变,这种转变被认为是一级和二级相变之间的中间类型。此外,β o相在环境温度下保留在 8Nb-TiAl 微结构中。ω o相从高度有序的 β o转变而来相,而不是来自具有低原子有序度 B2 (LOB2) 结构的α 2或 β o,Al 浓度在大约 850 °C 时为 32–43 at%。从实验检测来看,ω o相从β o相的转变被认为是一个进一步的排序过程。