摘要
采用机械合金化工艺和普通粉末冶金方法分别制备了Y_2O_3/Cr-Ni复合材料,研究了两种制备方法对Y_2O_3/Cr-Ni复合材料性能的影响.结果发现:机械合金化后,粉末的衍射峰宽化、衍射峰强度降低;经压坯烧结后制备的材料,其结构与普通粉末冶金制备的相比更均匀,致密化程度也更高,材料的室温硬度和抗拉强度都比传统粉末冶金法制备的材料要高.根据Larson-Miller参数方程对两种制备方法制备的氧化钇增强镍铬基复合材料的高温力学性能进行了模拟对比研究,高温模拟结果表明,试验材料的维氏硬度值和热处理参数P基本上是一种线性关系,说明Larson-Miller参数方程对镍基复合材料的寿命设计具有一定的适用性.高温热模拟后,机械合金化工艺制备的材料仍保持着良好的力学性能.
Y2O3/Cr-Ni composites were prepared by mechanical alloying （MA） and powder metallurgy （PM） respectively. The effect of mechanical alloying on the property of Y2O3/Cr-Ni composite was studied. It was found that the diffraction peaks of the Ni and Cr after the mechanical alloying became wider and the intensity of diffraction peaks dropped. The density, hardness and ultimate tensile strength of the composite prepared by MA were comparatively higher than those of a composite prepared by PM at room temperature. High temperature simulation for mechanical properties was carried out based on the Larson-Miller function. The simulation results showed that the Vicker＇s hardness of the tested materials was approximately proportional to the heat treatment parameter P, indicating that the Larson-Miller function was applicable for the life-span design of Ni-based composite. After heat treatment at high temperature, the composite prepared by MA still maintained good mechanical properties.
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
2008年第5期119-124,共6页
Journal of Lanzhou University(Natural Sciences)
基金
甘肃省自然科学基金(3ZS051-A25-048)资助.
关键词
机械合金化
粉末冶金
镍基复合材料
高温热模拟
力学性能
mechanical alloying
powder metallurgy
Ni-based composite
high temperature heat treatment
mechanical property
