采用传统的氢气烧结粉末冶金法制备钼镧合金,按质量百分比在钼粉中加入1 % La2O3后,经混料机混合均匀,进行2 t等静压压制,保压2 min,再进行1800 ℃氢气烧结,观察其金相组织。将坯料置于1450 ℃炉中保温15 min后进行轧制,随后逐步降温以控制晶粒长大。将锻造钼棒沿轴切成26mm长的骨头拉伸样和Φ4×6的圆柱压缩样,拉伸和压缩均在万能试验机上进行。维氏硬度采集方案:采用HVS-10型显微硬度计,在测试前将试样磨平并抛光,并保证样品上下表面平行,所有的测试压力为0.3 kg,保压时间为10 s。
The molybdenum-lanthanum alloy was prepared by the conventional hydrogen sintering powder metallurgy method. After adding 1 % La2O3 to the molybdenum powder according to the mass percentage, it was mixed well by a blender, isostatically pressed at 2 t, held for 2 min, and then hydrogen sintered at 1800 ℃ to observe its metallographic organization. The billet is rolled after being held in a furnace at 1450 ℃ for 15 min, followed by a gradual temperature reduction to control grain growth. The forged molybdenum rods were cut into 26 mm long bone tensile samples and Φ4×6 cylindrical compression samples along the axis, and both tensile and compression were performed on a universal testing machine. Vickers hardness acquisition scheme: HVS-10 micro hardness tester was used, and the specimens were ground and polished before testing, and the upper and lower surfaces of the samples were ensured to be parallel, and all test pressures were 0.3 kg with a holding time of 10 s.