摘要
采用低负荷维氏硬度计、电子万能材料试验机、动态热模拟机等研究了机械合金化(MA)与高温自蔓延(SHS)合成的MoSi2-X%(wt)La2O3复合材料的室温硬度、室温断裂韧度和高温屈服强度等力学性能与烧结工艺的关系。结果表明,该复合材料的室温硬度及断裂韧度均随La2O3含量的增加呈先增后略降的规律,其最大值分别为10.7GPa、6.20 MPa.m1/2。在不同温度烧结时,复合材料的断裂韧度值均高于纯MoSi2的断裂韧度值;采用SHS粉末制备的材料中,La2O3起到了一定的高温强化作用。MoSi2-0.8%(wt)La2O3材料具有较好的综合力学性能。
The relationship between sintering technology and the mechanical properties such as the ambient-temperature hardness, fracture toughness and high-temperature yield strength of the MoSi2-x%（wt）La2O3 composites synthesized by mechanical alloying （ MA）, self-propagation high temperature synthesis （SHS） were investigated by means of Vichers hardness tester, electrical omnipotence material tester and dynamic heat simulator. The results show that both ambienttemperature hardness and fracture toughness of the composites increase first and then decrease with increasing content of La2O3 ,and the maximum values of the specimens are 10. 7GPa and 6. 20 MPa· m^1/2, respectively. The fracture toughness of the composites is higher than that of the pure MoSi2 when sintering at different temperature ; in the materials synthesized by SHS,La2O3 plays a certain role for high-temperature strengthening. The MoSi2-0. 8% （wt）La2O3 specimens have good comprehensive mechanical performance.
出处
《金属热处理》
EI
CAS
CSCD
北大核心
2005年第10期56-59,共4页
Heat Treatment of Metals
基金
国家自然科学基金(50272015)
