摘要
通过XRD、BSE、EBSD等检测手段以及拉伸实验研究了Mn含量对FeMnCoCr系铸态双相高熵合金组织及力学性能的影响。结果表明,随着Mn含量的降低,商熇合金中FCC相和HCP相向BCC相转变,Fe_(70)Mn_(10)Co_(10)Cr_(10)合金中仅存在单一BCC相。变形后Fe_(53)Mn_(27)Co_(10)Cr_(10)、Fe_(55)Mn_(25)Co_(10)Cr_(10)和Fe_(58)Mn_(22)Co_(10)Cr_(10)晶体结构变化不大。变形后Fe_(60)Mn_(20)Co_(10)Cr_(10)中部分FCC相转变为HCP相,相变量约为10%。Fe_(65)Mn_(15)Co_(10)Cr_(10)在变形过程中FCC相和HCP相同时向BCC相转变而引起TRIP效应,使伸长率达到42%。Mn含量(摩乐分数)由20%向27%变化的过程中,商熵合金的屈服强度逐渐降低,抗拉强度与伸长率均呈现先降低后增高的趋势。Mn含量由20%进一步降低,商熵合金的抗拉强度仍呈现出升高的趋势。
The effect of Mn content on microstructure and mechanical properties of FeMnCoCr series as-cast dual-phase high-entropy alloys was investigated by testing means of XRD,BSE and EBSD,and tensile experiments.The results show that with the decrease of Mn content,FCC phase and HCP phase in the high-entropy alloys transform to BCC phase,and there is only a single BCC phase in Fe_(70)Mn_(10)Co_(10)Cr_(10) alloy.The crystal structure of Fe_(53)Mn_(27)Co_(10)Cr_(10),Fe_(55)Mn_(25)Co_(10)Cr_(10)and Fe_(58)Mn_(22)Co_(10)Cr_(10) alloys has little change after deformation.Part of FCC phase in Fe_(60)Mn_(20)Co_(10)Cr_(10)alloy transforms into HCP phase after deformation,and the phase variation is about 10%.FCC phase and HCP phase simultaneously transform into BCC phase during deformation of Fe_(65)Mn_(15)Co_(10)Cr_(10),which causes TRIP effect and alloy elongation of 42%.When the Mn content(molar fraction)changes from 20%to 27%,the yield strength of the high-entropy alloys gra-dually decreases,and both the tensile strength and elongation decrease at first and then increase.With the further decrease of Mn content from 20%,the tensile strength of the high-entropy alloys still shows an increasing trend.
作者
张鹏杰
陈连生
吕煜坤
王书桓
柳昆
ZHANG Peng-jie;CHEN Liansheng;LYU Yu-kun;WANG Shu-huan;LIU Kun(College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,China)
出处
《稀有金属与硬质合金》
CAS
CSCD
北大核心
2021年第6期67-72,共6页
Rare Metals and Cemented Carbides
基金
国家自然科学基金项目(51774139)
河北省自然科学基金项目(E2019209597)
河北省高等学校科学技术研究项目(QN2021115)。
