掺镧方式对La-TZM合金性能的影响

采用粉末冶金法在TZM合金的基础上,分别进行固-固掺杂稀土La2O3,固-液掺杂La(NO3)3,经烧结、热轧、温轧、冷轧后得到不同掺杂方式的La-TZM合金板材。用SEM观察粉末形貌、烧结坯组织及板材断口形貌,用粒度分布、EDS分别对合金粉末粒度及合金成分进行分析。结果表明:固-液掺杂La(NO3)3比固-固掺杂稀土La2O3的La-TZM合金板材第二相分布更为均匀、细小;晶粒尺寸较小;且固-液掺杂La(NO3)3合金的抗拉强度比固-固掺杂稀土La2O3也有显著提高,使其提高了10.9%。

Effect of Lanthanum Doping Method on Properties of La-TZM Alloy

Based on TZM molybdenum alloy, La-TZM alloy sheets, with solid-solid doping of rare earth La2O3 or liquid-solid doping of La(NO3)3, were manufactured by sintering, hot rolling, warm rolling and cold rolling. The powder morphology, microstructures of sintering compact and fracture morphology of the alloy sheets were observed by SEM, and the alloy powder particle size and alloy composition were analyzed by particle size distribution and EDS, respectively. The results show that the distribution of the second phase in the La(NO3)3 doped TZM alloy sheets is more uniform than that in La2O3 doped TZM alloy sheets. The grain size of La(NO3)3 doped TZM alloy is finer. Besides, the tensile strength of La(NO3)3 doped TZM alloy is much higher than that of La2O3 doped alloy, which increases by 10.9%.