【摘要】 钼铼合金属于高熔点、低膨胀系数的固溶强化合金，添加稀土氧化物能够细化钼铼合金晶粒，起到弥散强化的作用。采用粉末冶金技术和交叉轧制法制备钼铼（Mo–Re）合金和钼铼镧（Mo–Re–La₂O₃）合金板材，并对两种合金板材进行不同温度的退火热处理。通过金相显微镜和电子扫描显微镜观察了钼铼合金板材和钼铼镧合金板材在不同退火温度下合金显微组织和室温拉伸断口形貌，比较了两种合金板材的维氏硬度和室温拉伸性能。结果表明，钼铼合金的再结晶温度为1200℃左右，而钼铼镧合金的再结晶温度为1400℃，La₂O₃的加入使再结晶温度提升200℃左右；随着退火温度提高，钼铼合金和钼铼镧合金的硬度和抗拉强度显著降低，而钼铼镧合金的延伸率得以升高，最高可达27.5%。更多还原

【Abstract】 Molybdenum rhenium alloys are the solid solution strengthening alloys 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.Molybdenum-rhenium（Mo–Re） and molybdenum-rhenium-lanthanum （Mo–Re–La₂O₃） alloy plates were prepared by powder metallurgy and cross rolling method in this paper,and were annealed at different temperatures.The microstructure and room temperature tensile fracture morphology of the Mo–Re alloys and Mo–Re–La₂O₃ alloys annealed at different temperatures were observed by metallographic microscope and scanning electron microscope.The Vickers hardness and room temperature tensile properties of the two alloy plate were compared.The results show that the recrystallization temperature of Mo–Re alloys is about 1200℃,while that of the Mo–Re–La₂O₃ alloys is 1400℃.The addition of La₂O₃ increases the recrystallization temperature by about 200℃.With the increase of annealing temperature,the hardness and tensile strength of the Mo–Re alloys and Mo–Re–La₂O₃ alloys decrease significantly,while the elongation of Mo–Re–La₂O₃ alloys increases,up to 27.5%.更多还原