Mechanical properties and deformation mechanisms of Al0.1CoCrFeNi high-entropy alloys
CHEN Gang1, WANG Lu1, YANG Jing2, LI Qiang1, LYU Pin1, MA Sheng-guo1,2,3
1. Institute of Applied Mechanics and Biomedical Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2. Shanxi Key Laboratory of Material Strength and Structural Impact, Taiyuan University of Technology, Taiyuan 030024, China;
3. National Demonstration Center for Experimental Mechanics Education, Taiyuan University of Technology, Taiyuan 030024, China
Abstract:The Al0.1CoCrFeNi high-entropy alloy (HEA) was melted by vacuum magnetic levitation, and quasi-static tensile experiments were performed by using an INSTRON mechanical testing system. The crystal structure, surface morphology, composition, microstructure, hardness, and creep behavior of the samples before and after the experiment were analyzed by X-ray diffraction, optical microscopy, scanning electron microscopy, transmission electron microscopy, and nanoidentation. Results reveal that after tensile deformation, the alloy has an excellent strength-ductility combination, a significant strain-hardening effect, and an improved creep resistance. The fracture mode of sample is the typical microvoid accumulation fracture; there are a lot of microbands (the band width is about 200-300nm) inside the grains. The excellent strain-hardening ability is believed to be originated from the microband-induced plasticity effect during tensile loading.
[1] YEH J W, CHEN S K, LIN S J, et al. Nanostructured high-entropy alloys with multiple principal elements:novel alloy design concepts and outcomes[J]. Advanced Engineering Materials, 2004, 6(5):299-303.
[2] CANTOR B, CHANG I T H, KNIGHT P, et al. Microstructural development in equiatomic multicomponent alloys[J]. Materials Science and Engineering:A, 2004, 375/377(1):213-218.
[3] YAO H W, QIAO J W, GAO M C, et al. NbTaV-(Ti,W) refractory high-entropy alloys:experiments and modeling[J]. Materials Science and Engineering:A, 2016, 674:203-211.
[4] ZHAO Y J, QIAO J W, MA S G, et al. A hexagonal close-packed high-entropy alloy:the effect of entropy[J]. Materials & Design, 2016, 96:10-15.
[5] GLUDOVATZ B, HOHENWARTER A, CATOOR D, et al. A fracture-resistant high-entropy alloy for cryogenic applications[J]. Science, 2014, 345(6201):1153-1158.
[6] MA S G, JIAO Z M, QIAO J W, et al. Strain rate effects on the dynamic mechanical properties of the AlCrCuFeNi2 high-entropy alloy[J]. Materials Science and Engineering:A, 2016, 649:35-38.
[7] SENKOV O N, WILKS G B, SCOTT J M, et al. Mechanical properties of Nb25Mo25Ta25W25 and V20Nb20Mo20Ta20W20, refractory high entropy alloys[J]. Intermetallics, 2011, 19(5):698-706.
[8] HSU C Y, SHEU T S, YEH J W, et al. Effect of iron content on wear behavior of AlCoCrFexMo0.5Ni high-entropy alloys[J]. Wear, 2010, 268(5):653-659.
[9] 刘用,马胜国,刘英杰,等. AlxCrCuFeNi2多主元高熵合金的摩擦磨损性能[J]. 材料工程, 2018, 46(2):99-104. LIU Y, MA S G, LIU Y J, et al. Friction and wear properties of AlxCrCuFeNi2 high-entropy alloys with multi-principal-elements[J]. Journal of Materials Engineering, 2018, 46(2):99-104.
[10] MEYER M A. Mechanical behavior of materials[M]. Cambridge, United Kingdom:Cambridge University Press, 2004.
[11] GUTIERREZ-URRUTIA I, ZAEFFERER S, RAABE D. The effect of grain size and grain orientation on deformation twinning in a Fe-22wt.%Mn-0.6wt.%C TWIP steel[J]. Materials Science and Engineering:A, 2010, 527(15):3552-3560.
[12] SHEN Y F, JIA N, MISRA R D K, et al. Softening behavior by excessive twinning and adiabatic heating at high strain rate in a Fe-20Mn-0.6C TWIP steel[J]. Acta Materialia, 2016, 103:229-242.
[13] XU S, RUAN D, BEYNON J H, et al. Dynamic tensile behavior of TWIP steel under intermediate strain rate loading[J]. Materials Science and Engineering:A, 2013, 573(573):132-140.
[14] WANG Z, GAO M C, MA S G, et al. Effect of cold rolling on the microstructure and mechanical properties of Al0.25CoCrFe1.25Ni1.25, high-entropy alloy[J]. Materials Science and Engineering:A, 2015, 645:163-169.
[15] GAO M C, YEH J W, LIAW P K, et al. High-entropy alloys:fundamentals and applications[M]. Basel, Switzerland:Springer, 2015.
[16] GUTIERREZ-URRUTIA I, RAABE D. Microbanding mechanism in an Fe-Mn-C high-Mn twinning-induced plasticity steel[J]. Scripta Materialia, 2013, 69(1):53-56.
[17] WU W, SONG M, SONG N, et al. Dual mechanisms of grain refinement in a FeCoCrNi high-entropy alloy processed by high-pressure torsion[J]. Scientific Reports, 2017, 7:46720.
[18] WU W, GUO L, LIU B, et al. Effects of torsional deformation on the microstructures and mechanical properties of a CoCrFeNiMo0.15 high-entropy alloy[J]. Philosophical Magazine, 2017, 97(34):1-17.
[19] WANG Z, BAKER I, GUO W, et al. The effect of carbon on the microstructures, mechanical properties and deformation mechanisms of thermo-mechanically treated Fe40.4Ni11.3Mn34.8Al7.5Cr6, high entropy alloys[J]. Acta Materialia, 2017, 126:346-360.
[20] HUANG J C, GRAY Ⅲ G T. Microband formation in shock-loaded and quasi-statically deformed metals[J]. Acta Metallurgica, 1989, 37(12):3335-3347.
[21] ALAGARSAMY K, FORTIER A, KOMARASAMY M, et al. Mechanical properties of high entropy alloy Al0.1CoCrFeNi for peripheral vascular stent application[J]. Cardiovascular Engineering and Technology, 2016, 7(4):448-454.
[22] ZHANG L, YU P, CHENG H, et al. Nanoindentation creep behavior of an Al0.3CoCrFeNi high-entropy alloy[J]. Metallurgical & Materials Transactions A, 2016, 47(12):1-5.
[23] LI Z, ZHAO S, DIAO H, et al. High-velocity deformation of Al0.3CoCrFeNi high-entropy alloy:remarkable resistance to shear failure[J]. Scientific Reports, 2017, 7:42742.