Laves phase strengthening in ultrafine-grained Co–Cr–Ta micropillars under uniaxial compression at modest temperature

Zhao，Cancan1,2; Chu，Kangjie1; Mei，Qingsong2; Ren，Fuzeng1

2020-07-22

10.1016/j.msea.2020.139782

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   影响因子和分区

0921-5093

1873-4936

The substantial reduction in strength has limited the widespread usage of Co–Cr based alloys at elevated temperatures. Here, we designed and fabricated an ultrafine-grained Co–28Cr–3Ta alloy which could retain over 80% of its room temperature yield strength at 300 °C, two times that of its equivalent without addition of Ta. Such high thermal stability was achieved via a processing route which precipitated nanoscale Laves phases. The results demonstrate that Orowan strengthening operates as the dominant mechanism in the alloy. The dislocation loops formed from interactions between dislocations and precipitates could effectively prevent the dislocation gliding at modest temperature.

High-temperature deformation Laves phases Micropillar compression Spark plasma sintering Ultrafine-grained microstructure

SCI ; EI

英语

第一 ; 通讯

Fundamental Research Program of Shenzhen[JCYJ20170412153039309] ; Guangdong Innovative & Entrepreneurial Research Team Program[2016ZT06C279]

Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering

Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000551484000044

ELSEVIER SCIENCE SA

20202608860949

Chromium alloys

Chromium and Alloys:543.1

MATERIALS SCIENCE

2-s2.0-85087081833

Scopus

1.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,China
2.School of Power and Mechanical Engineering,Wuhan University,Wuhan,China

Zhao，Cancan,Chu，Kangjie,Mei，Qingsong,等. Laves phase strengthening in ultrafine-grained Co–Cr–Ta micropillars under uniaxial compression at modest temperature[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2020,791.

Zhao，Cancan,Chu，Kangjie,Mei，Qingsong,&Ren，Fuzeng.(2020).Laves phase strengthening in ultrafine-grained Co–Cr–Ta micropillars under uniaxial compression at modest temperature.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,791.

Zhao，Cancan,et al."Laves phase strengthening in ultrafine-grained Co–Cr–Ta micropillars under uniaxial compression at modest temperature".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 791(2020).