冷轧对Al_(10)Cu_(25)Co_(20)Fe_(20)Ni_(25)高熵合金组织结构及力学性能的影响

对铸态Al10Cu25Co20Fe20Ni25高熵合金进行冷轧处理后进行室温拉伸测试,并利用X射线衍射仪(XRD)和扫描电镜(SEM)分别对其相结构、微观组织形貌及拉伸断口进行分析。结果表明:经冷轧工艺处理后,Al10Cu25Co20Fe20Ni25高熵合金硬度最大为285HV,较轧制前提高了51.6%;在变形量为40%时,抗拉强度达到最大值,为638MPa,是铸态合金的2.7倍。拉伸断口分析表明,铸态合金的断裂模式为树枝晶沿晶断裂和韧窝型延性断裂,而冷轧态合金主要为韧窝型延性断裂模式。

Effect of Cold Rolling on Microstructures and Mechanical Properties of Al10Cu25Co20Fe20Ni25 High-entropy Alloys

The tensile testing of as‐cast Al10Cu25Co20Fe20Ni25 high‐entropy alloys after cold rolling was conducted upon at room temperature .The phase structure ,microstructural morphology ,and tensile fracture were investigated by the combination of X‐ray diffraction(XRD) and scanning electron micro‐scope(SEM ) .The results reveal that by cold‐rolling processing ,the Al10 Cu25 Co20 Fe20 Ni25 high‐entro‐py alloy hardness reaches the maximum up to 285HV ,increases by 51 .6% compared with the as‐cast sample .Moreover , the tensile strength reaches the maximum up to 638MPa ,when deformation amount is 40% ,is 2 .7 times of the as‐cast alloy .Tensile fracture analysis shows that the fracture mode of as‐cast alloy is dendrits intergranular fracture and ductile dimple fracture ,and the cold‐rolled alloys fracture mode is mainly ductile dimple fracture .