摘要
采用机械合金化+热压烧结的工艺路线制备Laves相TaCr_2合金,研究合金元素Mo对其显微组织、力学性能,特别是韧化效果的影响。结果表明:当Mo含量由0增加到5%(摩尔分数)时,Mo取代Laves相TaCr_2中Cr的位置为主。当Mo含量增加到7.6%和10%时,Mo取代Ta的位置更占优势。添加合金元素Mo的Laves相TaCr_2合金较未合金化的TaCr_2硬度略有降低;当Mo添加量≤7.6%,合金的断裂韧性微弱下降,当Mo含量达到10%时,合金断裂韧性要高于Mo添加量小于7.6%时的TaCr_2合金,达到4.26 MPa·m1/2。
Laves phase TaCr_2 alloys were prepared by mechanical alloying and hot-pressing sintering process,and the influences of alloy element Mo addition on microstructure,mechanical properties,especially fracture toughness of the TaCr_2 alloys were studied. The results show that Mo preferentially substitutes the Cr sites in the Laves phase TaCr_2 with the increasing of the Mo content from 0 to 5%（ mole fraction）. When the Mo content is 7. 6%-10%,Mo prefers to occupy the Ta sites. The hardness of the Laves phase TaCr_2 alloy with the addition of the alloying element Mo is slightly lower than that of the pristine TaCr_2 alloy. The fracture toughness of the alloy decreases slightly when the Mo content is less than 7. 6%,and becomes 4. 26 MPa·m1/2 when the Mo content is 10%.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2017年第12期19-24,共6页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51161020)
航空科学基金(2015ZF56024)
江西省自然科学基金(20114BAB216012)
