Microstructure Evolution and Strength-ductility Behavior of FeCoNiTi High-entropy Alloy

doi:10.11901/1005.3093.2019.557

Chinese Journal of Materials Research

2020, Vol. 34

Issue (7): 535-544 DOI: 10.11901/1005.3093.2019.557

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Microstructure Evolution and Strength-ductility Behavior of FeCoNiTi High-entropy Alloy

LIU Yi¹, XU Kang¹, TU Jian¹^,²(

), HUANG Can¹, WU Wei¹, TAN Li¹, ZHANG Yanbin¹, YIN Ruisen³, ZHOU Zhiming¹^,²

1.School of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China
2.Chongqing Municipal Key Laboratory of Institutions of Higher Education for Mould Technology, Chongqing University of Technology, Chongqing 400054, China
3.School of Aerospace Engineering, Chongqing University, Chongqing 400030, China

Cite this article:

LIU Yi, XU Kang, TU Jian, HUANG Can, WU Wei, TAN Li, ZHANG Yanbin, YIN Ruisen, ZHOU Zhiming. Microstructure Evolution and Strength-ductility Behavior of FeCoNiTi High-entropy Alloy. Chinese Journal of Materials Research, 2020, 34(7): 535-544.

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Abstract

A new type of dual-phase high-entropy alloy (FeCoNiTi) was designed by means of thermodynamic software and then block material of FeCoNiTi high-entropy alloy was prepared via vacuum arc smelting and then heat treatment. Characterization results demonstrate that the as-homogenized FeCoNiTi alloy presents dual-phase microstructure composed of the lamellar structure (hexagonal close packed (Laves) phase) and the Widmanstätten laths (face-centered cubic (FCC) phase). The FeCoNiTi alloy shows excellent comprehensive property at room temperature with compressive strength σ_b=2.08 GPa and compression strain ε=20.3%. The high strength can mainly be attributed to the hard Laves phase (lamellar structure) strengthening; while dislocation slip and deformation twin in the soft FCC phase (Widmanstätten laths) provide the ductility.

Key words: metallic materials high entropy alloy strength-ductility dual-phase widmanstätten laths

Received: 02 December 2019

ZTFLH:

TG113.1

Fund: Basic and Advanced Research Project of CQ CSTC(2017jcyjAX0381);Science and Technology Research Program of Chongqing Municipal Education Commissio(KJQN201801139);China Postdoctoral Science Foundation Funded Project(2018M632250)

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	Articles by authors
	Yi LIU
	Kang XU
	Jian TU
	Can HUANG
	Wei WU
	Li TAN
	Yanbin ZHANG
	Ruisen YIN
	Zhiming ZHOU

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.557 OR https://www.cjmr.org/EN/Y2020/V34/I7/535

Fig.1 Fraction of stable phases as function of temperature calculated by CAPHAD for (a) FeCoNi and (b) FeCoNiTi

Fig.2 (a) the optical microscopy images of the as-cast FeCoNiTi HEA, revealing the nearly equiaxial dendrite structure; (b) the homogenized microstructure, revealing coarse grain boundary and Widmanstätten laths

Fig.3 Back-scattered electron images of the as-homogenized FeCoNiTi HEA (a) lamellar structure and Widmanstätten laths; (b) Widmanstätten laths showing misorientation of 29.3°, 62.8° and 89.1° (marked by arrows) with respect to the embedding lamellar structure, Widmanstätten laths with three different angles of intersection are revealed, i.e., 39.1°，55.8° and 70.1° (marked by arrows); two Widmanstätten laths showing two shapes: strip in (c) and triangle in (d)

Fig.4 (a), (b) and (c) band contrast map, inverse pole figure and phase map, respectively. The inset shows X-ray diffraction patterns. Relationship between FCC and Laves phases: pole figure of FCC phase in (d), and pole figure of Laves phase in (e), revealing the S-N relationship between the Laves phase and its adjacent FCC phase in the white rectangle of (c)

Fig.5 (a) and (b) shows the widmanstätten laths and lamellar structure

Table 1 Chemical composition of lamellar structure (locations 1 and 3) and Widmanstätten laths (locations 2 and 4)

Fig.6 (a) compressive stress-strain curve, (b) compressive fracture morphology of FeCoNiTi HEA

Fig.7 SEM images under the different magnification for the as-deformed FeCoNiTi HEA; two typical types of deformation microstructure are detectable in (a) and (b); the distorted lamellar structure in (c); the lenticular twins in (d)

Fig.8 shows EBSD maps for the deformed FeCoNiTi HEA (a) IPF map showing two coarse grains; (b) grain boundary map showing low angle boundaries (LABs, marked by gray lines), high angle boundaries (HABs, marked by black lines). and twinning boundaries (TBs, marked by red lines); grain boundary misorientation statistical results of FCC phase and Laves phase in (c) and (d), respectively; (e) and (f) showing dual phase microstructure under higher magnification images: Laves phase (lamellar structure) embedded in FCC phase; (g) kernel average misorientation map showing the deformation behavior in FCC and Laves phases

Table 2 The enthalpy of mixing (ΔH_mix, kJ mol-1) of binary equiatomic alloys calculated by Miedema's approach. The atom radius, valence electron concentrations (VEC) and Young’s modili of Fe, Co, Ni, Ti

Fig.9 Microstructure evolution of FeCoNiTi HEA (a) Liquid, (b) As-cast, (c) As-homogenized, (d) Deformed

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