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Influence of Hot Isostatic Pressing Temperature on Microstructure and Mechanical Properties of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si Alloy
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DOI：10.1007/s40195-025-01820-6.png)
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Abstract
En 中文
Hot isostatic pressing (HIP) temperature has a significant impact on the service performance of powder metallurgy titanium alloys. In this study, a high-temperature titanium alloy, Ti-6.5Al-3.5Mo-1.5Zr-0.3Si, was prepared under different HIP temperatures (880-1000 degrees C), and the microstructural evolution and mechanical properties were systematically investigated. The results demonstrated that the HIPed alloys were predominantly composed of more than 80 vol.% alpha phase and a small amount of beta phase, and their phase compositions were basically unaffected by the HIP temperatures. Under the typical single-temperature-maintained HIP (STM-HIP) regime, the microstructure of alloy significantly coarsened as the HIP temperature increased, and the alloy strength exhibited an obvious linear negative correlation with the HIP temperature. On the basis of Hall-Petch relation, the prediction model of grain size was established, and the mathematical equation between HIP temperature and grain size d=MTHIP-N-2\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\left( {d = M\left( {T_{{{\text{HIP}}}} - N} \right)<^>{ - 2} } \right)$$\end{document} was deduced. Furthermore, a possible evolution mechanism of microstructure was proposed, which could be divided into the decomposition of initial alpha ' martensite for as-received powder, formation of the globular alpha grains in prior particle boundaries (PPBs) region, and precipitation of the platelet alpha grains in non-PPBs region. For these alloys prepared by the dual-temperature-maintained HIP (DTM-HIP) regime, although their tensile properties were comparable to that of alloy prepared by STM-HIP regime with same high-temperature holding stage, higher proportion of globular alpha grains occurred due to more recrystallization nucleation during the low-temperature holding stage, which probably provided a solution for improving the dynamic service performance of HIPed alloys.
Keywords:
Powder metallurgy
Hot isostatic pressing
Titanium alloy
Mechanical properties
Microstructure evolution
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