Microstructural comparison of hot isostatically pressed Mo10Nb alloys before and after hot rolling

• Published in: Materials characterization 2024-05, Vol.211, Article 113849
• Main Authors: Luo, Ning, Cai, Hao, Chen, Manhua, Ni, Jinbo, Niu, Bingbo, Liu, Qilong, Wu, Xiaochao, Yang, Kaijun, Li, Qingkui, He, Jilin
• Format: Article
• Language: English
• Subjects: Hot isostatic pressing; Hot rolling; Microstructure; Mo[sbnd]10Nb alloys; Oxidation
• ISSN: 1044-5803; 1873-4189
• DOI: 10.1016/j.matchar.2024.113849

In this work, hot isostatic pressing (HIP) and HIP followed by hot rolling (HIP+HR) were employed to process high-performance Mo10Nb alloys, respectively. The relative density, O content, oxide types, grain size and shape, and texture type of HIP-processed Mo10Nb alloys before and after HR were systematically investigated. The results indicate that the relative densities of Mo10Nb alloys prepared by the two methods are both over 98%. The oxygen content of HIP-processed and (HIP+HR)-processed Mo10Nb alloys is 638 ± 38 ppm and 2297 ± 152 ppm, respectively. X-ray photoelectron spectrometry (XPS) confirms that the main oxides in HIP-processed Mo10Nb alloys are MoO2, MoO3, NbO and Nb2O5 while those in (HIP+HR)-processed Mo10Nb alloys are stable MoO3 and Nb2O5 resulting from the oxygen contamination during HR. More importantly, HR crushes large Nb-rich phase particles and elongates equiaxed grain in HIP-processed Mo10Nb alloys. The high temperature during HR leads to the moderate growth of grains. Noteworthy, two weak textures along {001}〈110〉 and {111} orientations were found in HIP-processed Mo10Nb alloys after HR, which could be caused by the incomplete development of deformation textures and recrystallization textures. This work helps us to clarify the microstructure difference of HIP-processed Mo10Nb alloys before and after HR, which can provide some valuable science and technology guidance for fabrication of refractory alloys by powder metallurgy and the following plastic deformation. •Relative densities of Mo10Nb alloys prepared by HIP and HIP+HR are both over 98%.•Oxygen content in HIP-processed Mo10Nb alloys increases ∼3.5 times after HR.•Metastable MoO2 and NbO are transformed to stable MoO3 and Nb2O5 after HR.•Grain sizes grow a little and Nb-rich phase particles are refined after HR.•Weak textures along {001} and {111} orientations are found after HR.