稀土氧化物对钼合金高温变形抗力的影响

Effect of Rare Earth Oxide on High Temperature Deformation Resistance of Molybdenum Alloy

钼合金是少量的其他金属成分加入到纯钼基体中构成的有色合金,具有良好的高温强度,其中TZM合金更是广泛应用于高温环境下的工况.在粉末冶金制备TZM合金的工艺中加入稀土元素,研究了合金在1 100 ℃~1 500 ℃下的应力变化情况.实验结果表明:随着温度的升高钼合金的变形抗力降低,力学性能下降,但是随着稀土氧化物掺杂量的增加合金的高温变形抗力增加.掺杂镧能够有效提高钼合金的高温性能,在TZM合金中添加稀土,能够有效地提高TZM合金在高温下抵抗变形的能力.

Molybdenum alloy is a non-ferrous alloy formed by adding a small amount of other metal components to a pure molybdenum matrix. It has high strength at high temperature. The TZM alloys are widely used in high temperature conditions. The stress-strain of TZM alloy at 1100 ℃ to 1500 ℃ was studied by adding rare earth elements in the process of preparing TZM alloy by powder metallurgy. The experimental results show that with the increase of temperature, the deformation resistance of molybdenum alloy decreases and the mechanical properties decrease. However, the high temperature deformation resistance of the alloy increases with the increase of rare earth oxide doping. The doped lanthanum can effectively improve the high temperature performance of molybdenum alloy. The addition of rare earth elements can effectively improve the ability of TZM alloy to resist deformation at high temperature.