Positive effect of Mo on mechanical properties of a Ni-42W-10Co-xMo medium heavy alloyOA
In this study,a novel Ni-W-Co-Mo medium heavy alloy(MHA)was designed to improve its mechanical strength via Mo doping.In the Ni-42W-10Co-x Mo alloy series,where x represents the weight percent of Mo and varies between 0,1,2,5,and 10,the microstructure transitions from a dendritic structure to a hypo-eutectic structure as the Mo content increases from 0 to 5wt.%.Moreover,as the Mo content increases from 0 to 10wt.%,the distribution of theμ-phase shifts from being individually dispersed to forming aggregates,and its volume fraction rises from 0.5%to 7.9%.Notably,theμ-phase evolves into an eutectic microstructure,which helps in minimizing the segregation of elements.This change is accompanied by a substantial enhancement in mechanical properties;specifically,the compressive yield strength at room temperature increases from 350 MPa to 646 MPa,indicating a significant 85%increase.Similarly,the microhardness increases from 230 HV to 304 HV.Molecular dynamics simulations further reveal that the strengthening mechanism of Ni-42W-10Co-x Mo alloys is Mo-induced solid solution strengthening and precipitation strengthening.
Guo-xin Cao;Jian-xin Dong;Yong-sheng He;He Jiang;Fang Hao;Zhi-hua Nie;Teng-fei Ma;Bao-quan Fu
School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China Xi''an Superalloy Technology Co.,Ltd.,Xi’an 710299,ChinaSchool of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,ChinaXi''an Superalloy Technology Co.,Ltd.,Xi’an 710299,ChinaSchool of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,ChinaXi''an Superalloy Technology Co.,Ltd.,Xi’an 710299,ChinaSchool of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,ChinaKey Laboratory of Air-driven Equipment Technology of Zhejiang Province,Quzhou University,Quzhou 324000,Zhejiang,ChinaXi''an Superalloy Technology Co.,Ltd.,Xi’an 710299,China
金属材料
medium-heavy alloysNi-based alloymechanical propertiessolid solution strengtheningprecipitation strengthening
《China Foundry》 2025 (1)
P.108-116,9
financially supported by the National Natural Science Foundation of China(Grant No.51771016)。
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