Enhanced strain hardening induced by twin boundary-dislocation interaction in micro-pillar compression of CoCrNi medium-entropy alloy

Shang，X. K.1,2; Guan，Q. W.2; He，B. B.1,2

2022-08-01

10.1016/j.mtla.2022.101491

Materialia   Impact Factor & Quartile

2589-1529

In this contribution, we compare the mechanical behaviors of single crystal micro-pillars of CoCrNi medium -entropy alloy with and without deformation twins during compression test. It is found that the micro-pillar with deformation twins maintains higher increment of flow stress as compared to the one without deformation twins. The enhanced strain hardening behavior is ascribed to the substantially increased dislocation density resulted from the intensive twin boundary-dislocation interaction. The present study evidences the critical role of deformation twinning in the improved work hardening behavior of twinning-related deformation mechanism of alloys with low stacking fault energy such as CoCrNi.

Deformation twin Dislocations Strain hardening Micro-pillar Medium-entropy alloy

ESCI ; EI

English

First ; Corresponding

Natural Science Foundation of China[U52071173] ; Science and Technology Innova-tion Commission of Shenzhen["JCYJ20210324120209026","ZDSYS20200810171201007","KQTD2019092917250571"] ; Guang-dong Basic and Applied Basic Research Foundation[2021A1515110480]

Materials Science

Materials Science, Multidisciplinary

WOS:000827348400011

ELSEVIER SCI LTD

20222612294806

Cobalt alloys ; Compression testing ; Deformation ; Entropy ; High-entropy alloys ; Single crystals ; Strain hardening ; Twinning

Metallurgy and Metallography:531 ; Heat Treatment Processes:537.1 ; Chromium and Alloys:543.1 ; Iron Alloys:545.2 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Thermodynamics:641.1 ; Crystalline Solids:933.1 ; Crystal Growth:933.1.2

2-s2.0-85132917619

Web of Science

1.Shenzhen Key Laboratory of Cross-Scale Manufacturing Mechanics,Southern University of Science and Technology,Shenzhen,518055,China
2.Department of Mechanical and Energy Engineering,SUSTech: Southern University of Science and Technology,Shenzhen,1088 Xueyuan Ave, Nanshan,518055,China

Shang，X. K.,Guan，Q. W.,He，B. B.. Enhanced strain hardening induced by twin boundary-dislocation interaction in micro-pillar compression of CoCrNi medium-entropy alloy[J]. Materialia,2022,24.

Shang，X. K.,Guan，Q. W.,&He，B. B..(2022).Enhanced strain hardening induced by twin boundary-dislocation interaction in micro-pillar compression of CoCrNi medium-entropy alloy.Materialia,24.

Shang，X. K.,et al."Enhanced strain hardening induced by twin boundary-dislocation interaction in micro-pillar compression of CoCrNi medium-entropy alloy".Materialia 24(2022).