Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第27卷    第3期    总第216期    2017年3月

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文章编号:1004-0609(2017)-03-0525-07
近快速凝固条件下Ni-50%Sc金属间化合物韧脆性
原志鹏,崔红保,陈 昊,常亚涛,郭学锋

(河南理工大学 材料科学与工程学院,焦作 454000)

摘 要: 通过真空电弧熔炼水冷铜模吸铸法制备Ni-50%Sc合金,用XRD和EDS分析合金的相组成,研究其金属间化合物的韧脆性。结果表明:凝固组织为B2-NiScp+(NiSc+Ni2Sc)e,其中共晶组织分布在晶界与枝晶臂之间。在外力作用下的受力链“B2p-晶界1-Ni2Sce-晶界2-B2e-晶界2-Ni2Scp-晶界3-B2e”中,Ni2Sce和与其相连的晶界是裂纹产生的区域,而B2-NiSc是塑性较好、在外力作用下可以发生较大变形的金属间化合物。

 

关键词: 金属间化合物;第一性原理;B2-NiScp;(NiSc+Ni2Sc)e;裂纹萌生

Ductility of near rapidly solidified Ni-50%Sc intermetallics
YUAN Zhi-peng, CUI Hong-bao, CHEN Hao, CHANG Ya-tao, GUO Xue-feng

School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China

Abstract:Ni-50%Sc alloy was prepared with a vacuum arc smelting and water cooled copper mold suction-casting machine. XRD was used to identify phase microstructural components, and the composition of each phase was analyzed with EDS. The ductility of intermetallics was studied. The results show that the solidification structure is B2-NiScprimary and (Ni2Sc+NiSc)eutectic, and the eutectic is distributed between the grain boundaries and dendrite arms. The Ni2Sceutectic and grain boundary connected with Ni2Sceutectic are the nucleation region of the crack among force chain of B2primary-grain boundary1-Ni2Sceutectic-grain boundary2-B2eutectic-Ni2Sceutectic-grain boundary3-B2primary. NiSc plasticity is better than Ni2Sc by using the first-principles plane-wave pseudo-potential method based on density functional theory. Intermetallic NiSc with B2-structure is a ductile phase, which experiences large deformation under external force.

 

Key words: intermetallic compound; first-principles; B2-NiScprimary; (Ni2Sc+NiSc)eutectic; crack nucleation

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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