AlMo_(0.5)NbTa_(0.5)TiZr难熔高熵合金微观组织及力学性能研究
|
摘要
为明确AlMo_(0.5)NbTa_(0.5)TiZr难熔高熵合金在铸态条件下的相组成、元素偏析以及室温力学性能,文中通过氩气保护真空电弧熔炼法制备了AlMo_(0.5)NbTa_(0.5)TiZr合金。采用X射线衍射仪(XRD)、热分析仪(DSC)和扫描电子显微镜(SEM)分别对该合金进行了物相分析、热稳定性分析以及组织分析。利用显微维氏硬度计测量了合金在室温下的硬度。通过电子万能试验机对合金进行了室温压缩试验。结果表明:铸态AlMo_(0.5)NbTa_(0.5)TiZr合金除bcc相的衍射峰外,无其他相的衍射峰出现,说明合金主要由bcc相组成;在400～1 350℃范围内,合金无吸热或放热现象出现,合金未发生固态相变,具有较高的热稳定性;合金的铸态组织为典型的枝晶状凝固组织,可分为三个微观区域,富Mo-Nb-Ta枝晶心部区域,富Al-Zr枝晶间区域以及富Al-Ti-Zr的枝晶边缘过渡区域;合金室温下的平均硬度可达625HV,抗压强度约为2 100MPa。
The paper is intended to clarify the phase composition,elements segregation and mechanical properties at room temperature of AlMo_(0.5)NbTa_(0.5)TiZr refractory high entropy alloy.The alloy was prepared by a vacuum arc melting with argon shield.Its phase,thermal stability and microstructure were studied by an X-ray diffractometer,a differential scanning calorimeter and a scanning electron microslope.Its hardness was measured with a vickers microhardness unit at room temperature.The compression tests at room temperature were conducted by an electron universal testing machine.The results are as follows.The diffraction peaks of the refractory high entropy alloy AlMo_(0.5)NbTa_(0.5)TiZr in the as-cast condition showed the presence of only bcc phase with no other phases present,which indicatesthat the alloy consists mainly of bcc phase.Any endothermic or exothermic phenomenon related to solidstate phase transition did not appear at the temperatures from 400 ℃ to 1 350 ℃,indicating that the alloy has the higher thermal stability.The microstructure of the alloy is the dendritic structure consisting of the dendrites cores region,the interdendritic region and the transitional layer between the dendrites cores and interdendritic regions,corresponding to rich Mo-Nb-Ta region,rich Al-Zr region and rich AlTi-Zr region,respectively.The value of hardness of the as-cast AlMo0.5 NbTa0.5 TiZr alloy at room temperature was up to 625 HV,and its compressive strength was close to 2 100 MPa.
The paper is intended to clarify the phase composition,elements segregation and mechanical properties at room temperature of AlMo_(0.5)NbTa_(0.5)TiZr refractory high entropy alloy.The alloy was prepared by a vacuum arc melting with argon shield.Its phase,thermal stability and microstructure were studied by an X-ray diffractometer,a differential scanning calorimeter and a scanning electron microslope.Its hardness was measured with a vickers microhardness unit at room temperature.The compression tests at room temperature were conducted by an electron universal testing machine.The results are as follows.The diffraction peaks of the refractory high entropy alloy AlMo_(0.5)NbTa_(0.5)TiZr in the as-cast condition showed the presence of only bcc phase with no other phases present,which indicatesthat the alloy consists mainly of bcc phase.Any endothermic or exothermic phenomenon related to solidstate phase transition did not appear at the temperatures from 400 ℃ to 1 350 ℃,indicating that the alloy has the higher thermal stability.The microstructure of the alloy is the dendritic structure consisting of the dendrites cores region,the interdendritic region and the transitional layer between the dendrites cores and interdendritic regions,corresponding to rich Mo-Nb-Ta region,rich Al-Zr region and rich AlTi-Zr region,respectively.The value of hardness of the as-cast AlMo0.5 NbTa0.5 TiZr alloy at room temperature was up to 625 HV,and its compressive strength was close to 2 100 MPa.
引文
[1]HUANG P K,YEH J W,SHUN T T,et al.Multi‐Principal‐Element Alloys with Improved Oxidation and Wear Resistance for Thermal Spray Coating[J].Advanced Engineering Materials,2004,6(1/2):74.
[2]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.
[3]ZHOU Y J,ZHANG Y,WANG Y L,et al.Solid Solution Alloys of AlCoCrFeNiTix with Excellent Room-temperature Mechanical Properties[J].Applied Physics Letters,2007,90(18):253.
[4]ZHU J M,FU H M,ZHANG H F,et al.Microstructures and Compressive Properties of Multicomponent AlCoCrCuFeNiMox Alloys[J].Materials Science&Engineering A,2010,527(26):6975.
[5]JOO S H,KATO H,JANG M J,et al.Tensile Deformation Behavior and Deformation Twinning of an Equimolar CoCrFeMnNi High-Entropy Alloy[J].Materials Science&Engineering:A,2017,689:122.
[6]JING M J,PRAVEEN S,SUNG H J,et al.Hightemperature Tensile Deformation Behavior of Hot Rolled CrMnFeCoNi High-Entropy Alloy[J].Journal of Alloys and Compounds,2017,730:242.
[7]CHEN M R,LIN S J,YEH J W,et al.Effect of Vanadium Addition on the Microstructure,Hardness,and Wear Resistance of Al0.5CoCrCuFeNi High-Entropy Alloy[J].Metallurgical and Materials Transactions A,2006,37(5):1363.
[8]CHUANG M H,TSAI M H,WANG W R,et al.Microstructure and Wear Behavior of AlxCo1.5CrFeNi1.5Tiy,High-Entropy Alloys[J].Acta Materialia,2011,59(16):6308.
[9]HSU C Y,YEH J W,CHEN S K,et al.Wear Resistance and High-temperature Compression Strength of FCC CuCoNiCrAl0.5Fe Alloy with Boron Addition[J].Metallurgical and Materials Transactions A,2004,35(5):1465.
[10]CHOU Y L,YEH J W,SHIH H C.The Effect of Molybdenum on the Corrosion Behaviour of the High-Entropy Alloys Co1.5CrFeNi1.5Ti0.5Moxin A-queous Environments[J].Corrosion Science,2010,52(8):2571.
[11]YE Q F,FENG K,LI Z G,et al.Microstructure and Corrosion Properties of CrMnFeCoNi High Entropy Alloy Coating[J].Applied Surface Science,2017,396:1420.
[12]GLUDOVATZ B,HOHENWATER A,CATOOR D,et al.A Fracture-resistant High-Entropy Alloy for Cryogenic Applications[J].Science,2014,345(6201):1153.
[13]LI D Y,ZHANG Y.The Ultrahigh Charpy Impact Toughness of Forged AlxCoCrFeNi High Entropy Alloys at Room and Cryogenic Temperatures[J].Intermetallics,2016,70:24.
[14]SENKOV O N,WILKS G B,MIRACLE D B,et al.Refractory High-Entropy Alloys[J].Intermetallics,2010,18(9):1758.
[15]SENKOV O N,SENKOVA S V,WOODWARD C.Effect of Aluminum on the Microstructure and Properties of Two Refractory High-Entropy Alloys[J].Acta Materialia,2014,68:214.
[16]SENKOV O N,WOODWARD C,MIRACLE D B.Microstructure and Properties of Aluminum-Containing Refractory High-Entropy Alloys[J].JOM,2014,66(10):2030.
[17]JENSEN J K,WELK B A,WILLIAMS R E A,et al.Characterization of the Microstructure of the Compositionally Complex Alloy Al1Mo0.5Nb1Ta0.5Ti1Zr1[J].Scripta Materialia,2016,121:1.
[18]SENKOV O N,ISHEIM D,SEIDMAN D N,et al.Development of a Refractory High Entropy Superalloy[J].Entropy,2016,18(3):102.
[19]JENSEN J K.Characterization of a High Strength,Refractory High Entropy Alloy,AlMo0.5NbTa0.5TiZr[D].Columbus:The Ohio State University,2017.
[20]YANG X,ZHANG Y.Prediction of High-Entropy Stabilized Solid-solution in Multi-component Alloys[J].Materials Chemistry and Physics,2012,132(2/3):233.
[2]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.
[3]ZHOU Y J,ZHANG Y,WANG Y L,et al.Solid Solution Alloys of AlCoCrFeNiTix with Excellent Room-temperature Mechanical Properties[J].Applied Physics Letters,2007,90(18):253.
[4]ZHU J M,FU H M,ZHANG H F,et al.Microstructures and Compressive Properties of Multicomponent AlCoCrCuFeNiMox Alloys[J].Materials Science&Engineering A,2010,527(26):6975.
[5]JOO S H,KATO H,JANG M J,et al.Tensile Deformation Behavior and Deformation Twinning of an Equimolar CoCrFeMnNi High-Entropy Alloy[J].Materials Science&Engineering:A,2017,689:122.
[6]JING M J,PRAVEEN S,SUNG H J,et al.Hightemperature Tensile Deformation Behavior of Hot Rolled CrMnFeCoNi High-Entropy Alloy[J].Journal of Alloys and Compounds,2017,730:242.
[7]CHEN M R,LIN S J,YEH J W,et al.Effect of Vanadium Addition on the Microstructure,Hardness,and Wear Resistance of Al0.5CoCrCuFeNi High-Entropy Alloy[J].Metallurgical and Materials Transactions A,2006,37(5):1363.
[8]CHUANG M H,TSAI M H,WANG W R,et al.Microstructure and Wear Behavior of AlxCo1.5CrFeNi1.5Tiy,High-Entropy Alloys[J].Acta Materialia,2011,59(16):6308.
[9]HSU C Y,YEH J W,CHEN S K,et al.Wear Resistance and High-temperature Compression Strength of FCC CuCoNiCrAl0.5Fe Alloy with Boron Addition[J].Metallurgical and Materials Transactions A,2004,35(5):1465.
[10]CHOU Y L,YEH J W,SHIH H C.The Effect of Molybdenum on the Corrosion Behaviour of the High-Entropy Alloys Co1.5CrFeNi1.5Ti0.5Moxin A-queous Environments[J].Corrosion Science,2010,52(8):2571.
[11]YE Q F,FENG K,LI Z G,et al.Microstructure and Corrosion Properties of CrMnFeCoNi High Entropy Alloy Coating[J].Applied Surface Science,2017,396:1420.
[12]GLUDOVATZ B,HOHENWATER A,CATOOR D,et al.A Fracture-resistant High-Entropy Alloy for Cryogenic Applications[J].Science,2014,345(6201):1153.
[13]LI D Y,ZHANG Y.The Ultrahigh Charpy Impact Toughness of Forged AlxCoCrFeNi High Entropy Alloys at Room and Cryogenic Temperatures[J].Intermetallics,2016,70:24.
[14]SENKOV O N,WILKS G B,MIRACLE D B,et al.Refractory High-Entropy Alloys[J].Intermetallics,2010,18(9):1758.
[15]SENKOV O N,SENKOVA S V,WOODWARD C.Effect of Aluminum on the Microstructure and Properties of Two Refractory High-Entropy Alloys[J].Acta Materialia,2014,68:214.
[16]SENKOV O N,WOODWARD C,MIRACLE D B.Microstructure and Properties of Aluminum-Containing Refractory High-Entropy Alloys[J].JOM,2014,66(10):2030.
[17]JENSEN J K,WELK B A,WILLIAMS R E A,et al.Characterization of the Microstructure of the Compositionally Complex Alloy Al1Mo0.5Nb1Ta0.5Ti1Zr1[J].Scripta Materialia,2016,121:1.
[18]SENKOV O N,ISHEIM D,SEIDMAN D N,et al.Development of a Refractory High Entropy Superalloy[J].Entropy,2016,18(3):102.
[19]JENSEN J K.Characterization of a High Strength,Refractory High Entropy Alloy,AlMo0.5NbTa0.5TiZr[D].Columbus:The Ohio State University,2017.
[20]YANG X,ZHANG Y.Prediction of High-Entropy Stabilized Solid-solution in Multi-component Alloys[J].Materials Chemistry and Physics,2012,132(2/3):233.