摘要
研究轻质(Ti_(60)Cr_(30)Nb_(10))_(100-x)Al_(x)(x=0,5,7.5,10,摩尔分数,%)中熵合金在铸态和均匀化态下的显微组织、力学性能和腐蚀行为。结果表明,随着Al含量从0增加到10%(摩尔分数),铸态合金均由相同的相组成,即体心立方(BCC)相和少量TiCr2型Laves相组成。均匀化后,所有合金均由单相BCC组成。此外,(Ti_(60)Cr_(30)Nb_(10))_(95)A_(l5)中熵合金表现出在铸态和均匀态条件下最优异的力学性能,屈服强度分别约为1048 MPa和1017 MPa,同时保持超50%压缩应变。与TC4和铸态(Ti_(60)Cr_(30)Nb_(10))_(95)A_(l5)合金相比,均匀态(Ti_(60)Cr_(30)Nb_(10))_(95)A_(l5)合金表现出更优异的耐腐蚀性能,这主要归因于均匀的显微组织与化学成分。
Microstructure,mechanical properties and corrosion behavior of lightweight(Ti_(60)Cr_(30)Nb_(10))_(100−x)Al_(x)(x=0,5,7.5 and 10,at.%)medium-entropy alloys(MEAs)were investigated in the as-cast and homogenized states.As the Al content increases from 0 to 10 at.%,all the as-cast MEAs consist of identical phase composition,i.e.,a body-centered cubic(BCC)phase and a small amount of TiCr2 Laves phase.After the homogenization,all the homogenized MEAs show a single BCC phase.The(Ti_(60)Cr_(30)Nb_(10))_(95)A_(l5) MEA shows the most excellent mechanical properties both in as-cast and homogenized states among the studied alloys,displaying yield strengths of~1048 MPa and~1017 MPa along with the compression strain exceeding 50%.Additionally,compared with the TC4 and the as-cast(Ti_(60)Cr_(30)Nb_(10))_(95)A_(l5) alloys,the homogenized(Ti_(60)Cr_(30)Nb_(10))_(95)A_(l5) alloy shows superior corrosion resistance due to its uniform microstructure and chemical composition.
作者
王浩
陈维平
郝良彦
褚晨亮
熊伟
付志强
Hao WANG;Wei-ping CHEN;Liang-yan HAO;Chen-liang CHU;Wei XIONG;Zhi-qiang FU(Guangdong Key Laboratory for Advanced Metallic Materials Processing,South China University of Technology,Guangzhou 510641,China;National Engineering Research Center of Near-net-shape Forming for Metallic Materials,South China University of Technology,Guangzhou 510641,China;Physical Metallurgy and Materials Design Laboratory,Department of Mechanical Engineering and Materials Science,University of Pittsburgh,Pittsburgh,PA,15261,USA)
基金
the financial supports from the National Natural Science Foundation of China (No. 52103360)
the Basic and Applied Basic Research Foundation of Guangdong Province, China (No. 2020A1515111104)
the Key-Area Research and Development Program of Guangdong Province (No. 2018B090905002)
the technical support of Sinoma Institute of Materials Research (Guangzhou) Co., Ltd. (China)。
关键词
中熵合金
轻质合金
显微组织
力学性能
腐蚀行为
medium-entropy alloy
lightweight alloy
microstructure
mechanical properties
corrosion behavior
