Positive effect of Mo on mechanical properties of a Ni-42W-10Co-xMo medium heavy alloy  

作　　者：Guo-xin Cao Jian-xin Dong Yong-sheng He He Jiang Fang Hao Zhi-hua Nie Teng-fei Ma Bao-quan Fu 

机构地区：[1]School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China [2]Xi'an Superalloy Technology Co.,Ltd.,Xi’an 710299,China [3]School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China [4]Key Laboratory of Air-driven Equipment Technology of Zhejiang Province,Quzhou University,Quzhou 324000,Zhejiang,China

出　　处：《China Foundry》2025年第1期108-116,共9页中国铸造(英文版)

基　　金：financially supported by the National Natural Science Foundation of China(Grant No.51771016)。

摘　　要：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.

关 键 词：medium-heavy alloys Ni-based alloy mechanical properties solid solution strengthening precipitation strengthening 

分 类 号：TG146.15[一般工业技术—材料科学与工程]