MA-HP法制备Al_(0.4)FeCrNiCo_(1.5)Ti_(0.3)高熵合金组织与性能研究(英文)  

Microstructure and Properties of Al_(0.4)FeCrNiCo_(1.5)Ti_(0.3) High Entropy Alloy Prepared by MA-HP Technique

作　　者：杨少锋[1] 张炎[1] 成家林[1] 朱晨[1] 陈维平[2] 

机构地区：[1]南京工程学院,江苏南京211167 [2]华南理工大学广东省金属新材料制备与成形重点实验室,广东广州510640

出　　处：《稀有金属材料与工程》2014年第12期2948-2952,共5页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51271080);Nanjing University of Technology Foundation(CKJB201204,QKJB201202,YKJ201307)

摘　　要：采用机械合金化-真空热压烧结(MA-HP)法制备了Al0.4FeCrNi Co1.5Ti0.3高熵合金。利用XRD、SEM和力学压缩试验机分析Al0.4FeCrNiCo1.5Ti0.3合金的微观组织、相转变以及力学性能。结果表明:经高能球磨10 h,合金中形成了简单固溶体fcc和bcc相,而经过热压烧结的Al0.4Fe Cr Ni Co1.5Ti0.3合金以单一fcc相及2种bcc相(bcc1、bcc2)组成。热压烧结Al0.4Fe Cr Ni Co1.5Ti0.3合金致密度达99.48%,其微观硬度(HV),屈服强度、断裂强度、压缩率分别达到725 MPa,2.13 GPa,2.54 GPa,20.1%,合金优异的力学性能主要是因为合金的固溶强化;断裂模式为解理断裂及塑性断裂的混合机制。Inequi-atomic Al0.4FeCrNiCo1.5Ti0.3 high entropy alloy has been fabricated by mechanical alloying （MA） and hot-pressing sintering （HP）. The microstructure, the phase evolution and the mechanical properties of Al0.4FeCrNiCo1.5Ti0.3 alloy were investigated by XRD, SEM and an instron testing system. Results show that a simplex solid solution consisting of fcc and bcc phase is formed in 10 h ball-milling time during MA, while a fee and two types ofbcc phase （bccl and bcc2） are noticed after HP process. The sintered alloy exhibits excellent comprehensive mechanical properties with a high relative density of 99.48%. The yield strength, the compressive strength, the compression ratio and Vickers hardness （HV） of the alloy are 2.13, 2.54 GPa, 20.1% and 7250 MPa, respectively. The superior strength of inequi-atomic Al0.4FeCrNiCo1.5Ti0.3 high entropy alloy is attributed to solid solution strengthening, and the fracture mechanism exhibits a mixed mechanism consisting of intergranular fracture and plastic fracture modes.

关 键 词：高熵合金 机械合金化-真空热压烧结 微观组织 

分 类 号：TG139[一般工业技术—材料科学与工程]