Martensitic twinning transformation mechanism in a metastable IVB element-based body-centered cubic high-entropy alloy with high strength and high work hardening rate

Huang，Yuhe1,2; Gao，Junheng1,3; Vorontsov，Vassili4; Guan，Dikai1; Goodall，Russell1; Dye，David4; Wang，Shuize3; Zhu，Qiang2; Rainforth，W. Mark1; Todd，Iain1

2022-10-10

10.1016/j.jmst.2022.03.005

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY   影响因子和分区

1005-0302

1941-1162

Realizing high work hardening and thus elevated strength–ductility synergy are prerequisites for the practical usage of body-centered-cubic high entropy alloys (BCC-HEAs). In this study, we report a novel dynamic strengthening mechanism, martensitic twinning transformation mechanism in a metastable refractory element-based BCC-HEA (TiZrHf)Ta (at.%) that can profoundly enhance the work hardening capability, leading to a large uniform ductility and high strength simultaneously. Different from conventional transformation induced plasticity (TRIP) and twinning induced plasticity (TWIP) strengthening mechanisms, the martensitic twinning transformation strengthening mechanism combines the best characteristics of both TRIP and TWIP strengthening mechanisms, which greatly alleviates the strength-ductility trade-off that ubiquitously observed in BCC structural alloys. Microstructure characterization, carried out using X-ray diffraction (XRD) and electron back-scatter diffraction (EBSD) shows that, upon straining, α” (orthorhombic) martensite transformation, self-accommodation (SA) α” twinning and mechanical α” twinning were activated sequentially. Transmission electron microscopy (TEM) analyses reveal that continuous twinning activation is inherited from nucleating mechanical {351} type I twins within SA ‘‘{351}’’<2¯11> type II twinned α” variants on {351} twinning plane by twinning transformation through simple shear, thereby accommodating the excessive plastic strain through the twinning shear while concurrently refining the grain structure. Consequently, consistent high work hardening rates of 2–12.5 GPa were achieved during the entire plastic deformation, leading to a high tensile strength of 1.3 GPa and uniform elongation of 24%. Alloy development guidelines for activating such martensitic twinning transformation strengthening mechanism were proposed, which could be important in developing new BCC-HEAs with optimal mechanical performance.

Martensitic transformation Metastable high entropy alloy Self-accommodating martensite Twinning transformation Work hardening rate

SCI ; EI

英语

其他

Engineering and Physical Sciences Research Council (EPSRC)[EP/P006566/1] ; Henry Royce Institute for Advanced Materials - EPSRC["EP/R00661X/1","EP/S019367/1","EP/P02470X/1","EP/P025285/1"] ; UKRI[MR/T019123/1]

Materials Science ; Metallurgy & Metallurgical Engineering

Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000803058200007

JOURNAL MATER SCI TECHNOL

20221611977967

Chemical activation ; Ductility ; Economic and social effects ; Entropy ; High resolution transmission electron microscopy ; High strength alloys ; High-entropy alloys ; Martensitic transformations ; Mechanisms ; Plastic deformation ; Stacking faults ; Strain ; Strain hardening ; Tensile strength ; Twinning

Metallurgy and Metallography:531 ; Metallurgy:531.1 ; Metallography:531.2 ; Heat Treatment Processes:537.1 ; Chromium and Alloys:543.1 ; Iron Alloys:545.2 ; Mechanisms:601.3 ; Thermodynamics:641.1 ; Optical Devices and Systems:741.3 ; Chemical Reactions:802.2 ; Chemical Products Generally:804 ; Crystal Lattice:933.1.1 ; Crystal Growth:933.1.2 ; Materials Science:951 ; Social Sciences:971

MATERIALS SCIENCE

2-s2.0-85128173569

Scopus

1.Department of Materials Science and Engineering,University of Sheffield,Sheffield,S1 3JD,United Kingdom
2.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.Beijing Advanced Innovation Center for Materials Genome Engineering,University of Science and Technology Beijing,Beijing,100083,China
4.Department of Materials,Royal School of Mines,Imperial College London,London,SW7 2BP,United Kingdom

Huang，Yuhe,Gao，Junheng,Vorontsov，Vassili,et al. Martensitic twinning transformation mechanism in a metastable IVB element-based body-centered cubic high-entropy alloy with high strength and high work hardening rate[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2022,124:217-231.

Huang，Yuhe.,Gao，Junheng.,Vorontsov，Vassili.,Guan，Dikai.,Goodall，Russell.,...&Todd，Iain.(2022).Martensitic twinning transformation mechanism in a metastable IVB element-based body-centered cubic high-entropy alloy with high strength and high work hardening rate.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,124,217-231.

Huang，Yuhe,et al."Martensitic twinning transformation mechanism in a metastable IVB element-based body-centered cubic high-entropy alloy with high strength and high work hardening rate".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 124(2022):217-231.