A comparison study on microstructures and fracture behaviours of a single NbSS solid solution alloy and a two-phase NbSS/Nb5Si3 alloy prepared by spark plasma sintering and arc melting

被引：13
作者：
Liao, Junhua [1 ]
Fei, Teng [1 ]
Li, Yun [1 ]
Yu, Youxing [1 ]
Sha, Jiangbo [1 ]
机构：
[1] Beijing Univ Aeronaut & Astronaut, Minist Educ, Key Lab Aerosp Mat & Performance, Sch Mat Sci & Engn, Beijing 100191, Peoples R China
来源：
MATERIALS CHARACTERIZATION | 2021年 / 178卷
关键词：
Intermetallics; Nb-Si based alloy; Microstructure; Fracture behaviour; Spark plasma sintering; Arc melting; IN-SITU COMPOSITES; MECHANICAL-PROPERTIES; TOUGHNESS; STRENGTH; STRESS; CAST; DISLOCATIONS; EVOLUTION; CLEAVAGE; NIOBIUM;
D O I：
10.1016/j.matchar.2021.111259
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Single Nb-SS phase alloy (Nb-37Ti-13Cr-2Al-1Si) and two-phase Nb-SS/Nb5Si3 alloy (hypoeutectic composition of Nb-16Si-24Ti-2Al-2Cr) powders prepared by the plasma rotating electrode atomization technique (PREA) were spark plasma sintered (SPS), and the microstructure, fracture toughness, deformation and fracture mode of the two SPS and arc melting (AM) alloys were characterized. With a coarsened grain size, the AM and SPS single Nb-SS phase alloy had a small difference in fracture toughness and it failed in a cleavage mode. As for the SPS two-phase Nb-SS/Nb5Si3 sample containing an ultra-fine ductile/stiffening Nb-SS/Nb5Si3 microstructure, approximately 1-2 mu m in phase size, a fracture toughness of as high as 16.1 MPa.m(1/2) was obtained, owing to operation of the active dislocation of a/2 < 111 > and dimple failure of the fine Nb-SS phase. However, the AM two-phase Nb-SS/Nb5Si3 microstructure had a coarsened Nb-SS phase and a low fracture toughness of 9.6 MPa.m(1/2), resulting from the movement of a < 100 > dislocation in the {001} cleavage planes and a cleavage failure mode of the coarsened Nb-SS phase.
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页数：12
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