Study on heat treatment properties of Mo-Re alloy strengthened by La2O3
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摘要: 钼铼合金属于高熔点、低膨胀系数的固溶强化合金，而稀土氧化物的添加能够细化晶粒，起到弥散强化的作用。本文通过钼铼合金（Mo-14%Re）和添加含量0.8%（质量分数）La2O3的钼铼镧合金板材在不同退火温度下，观察了合金显微组织和室温拉伸断口形貌的变化，比较了维氏硬度和室温拉伸性能。实验结果表明：随着退火温度的升高，钼铼镧合金的再结晶温度相较于钼铼合金的再结晶温度由1200℃提高到1400℃左右；钼铼合金和钼铼镧合金的硬度和强度逐渐降低，而钼铼镧合金的延伸率逐渐升高，最高可达27.5%。
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关键词:
Abstract: Molybdenum rhenium alloy is a solid solution strengthening alloy with high melting point and low expansion coefficient, and the addition of rare earth oxides can refine the grains and play a role in dispersion strengthening. In this paper, the microstructure and room temperature tensile fracture morphology of molybdenum rhenium alloy (Mo-14 % Re) and molybdenum rhenium lanthanum alloy sheet with 0.8 % (mass fraction) La2O3 were observed at different annealing temperatures, and the Vickers hardness and room temperature tensile properties were compared. The results show that with the increase of annealing temperature, the recrystallization temperature of molybdenum rhenium lanthanum alloy increases from 1200 °C to about 1400 °C compared with that of molybdenum rhenium alloy. The hardness and strength of molybdenum rhenium alloy and molybdenum rhenium lanthanum alloy gradually decrease, while the elongation of molybdenum rhenium lanthanum alloy gradually increases, up to 27.5 %. -
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