C、B对退火AlFeMnCoCr系高熵合金组织及性能的影响  

Effect of C and B on microstructure and properties of annealed AlFeMnCoCr high entropy alloy

作　　者：刘朝辉 曹炜鹏 李杰 冯运莉 Liu Zhaohui;Cao Weipeng;Li Jie;Feng Yunli(College of Metallurgy and Energy,North China University of Science and Technology,Tangshan Hebei 063210,China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063210

出　　处：《金属热处理》2025年第4期1-8,共8页Heat Treatment of Metals

基　　金：国家自然科学基金(51974134);河北省创新能力提升计划(24461002D);唐山市应用基础项目(21130237C)。

摘　　要：采用真空电弧熔炼法制备了Al_(1)Fe_(49)Mn_(30)Co_(10)Cr_(10)、Al_(1)Fe_(48.5)Mn_(30)Co_(10)Cr_(10)C_(0.5)、Al_(1)Fe_(48.475)Mn_(30)Co_(10)Cr_(10)C_(0.5)B_(0.025)3种成分的高熵合金,再经热轧、均匀化退火、冷轧和700℃退火30 min处理,采用XRD、EBSD和万能试验机研究C、B间隙原子对高熵合金微观组织和力学性能的影响。结果表明,C、B间隙原子的添加使高熵合金在热轧+均匀化退火后的晶粒尺寸变小,在700℃退火后的再结晶程度降低,组织中位错密度和小角度晶界含量增加,降低了退火孪晶的形成能力。B元素的添加强化了晶界,增加了晶界内聚力,降低了变形过程中晶间断裂的概率,提升了塑性,使Al_(1)Fe_(48.475)Mn_(30)Co_(10)Cr_(10)C_(0.5)B_(0.025)合金表现出优异的强塑积,达42.11 GPa·%。Al_(1)Fe_(49)Mn_(30)Co_(10)Cr_(10),Al_(1)Fe_(48.5)Mn_(30)Co_(10)Cr_(10)C_(0.5)and Al_(1)Fe_(48.475)Mn_(30)Co_(10)Cr_(10)C_(0.5)B_(0.025)high entropy alloys were prepared by vacuum arc melting method,and then hot rolling,homogenization,cold rolling and annealing at 700℃for 30 min for the three alloys were carried out.The effects of C and B interstitial atoms on the microstructure and mechanical properties of the tested high entropy alloys were studied by using XRD,EBSD and universal testing machine.The results show that the addition of C and B interstitial atoms makes the grain size of the alloys smaller after hot rolling and homogenization,and the degree of recrystallization reduces after annealing at 700℃,the dislocation density and the content of small angle grain boundaries increase,which reduces the formation ability of annealing twins.The addition of B element strengthens the grain boundary,increases the cohesion of the grain boundary,reduces the probability of intergranular fracture during deformation,and improves the plasticity,so that the Al_(1)Fe_(48.475)Mn_(30)Co_(10)Cr_(10)C_(0.5)B_(0.025)alloy exhibits excellent product of strength and elongation of 42.11 GPa·%.

关 键 词：高熵合金 间隙强化 微观组织 力学性能 

分 类 号：TG139[一般工业技术—材料科学与工程]