摘要
设计了(Ni_(40)Mn_(25)Fe_(25)Cr_(10))_(100-x)Ga_(x)(x=0、5、10)系列高熵合金,对其进行了冷轧和退火处理,并进行了拉伸性能测试。利用扫描电镜对合金组织形貌和断口进行表征,采用X射线衍射方法研究了合金的相组成。结果表明:Ga元素添加使Ni、Mn和Ga在晶界富集,并且析出形成L1_(2)相,L1_(2)相有效增强了合金强度,但使合金塑性下降。Ga元素的添加也使合金的耐腐蚀性能增强。时效态的强化方式主要是析出强化。(Ni_(40)Mn_(25)Fe_(25)Cr_(10))_(90)Ga_(10)在750℃退火后比(Ni_(40)Mn_(25)Fe_(25)Cr_(10))_(95)Ga_(5)在相同温度下的抗拉强度提高,塑性降低。
The(Ni_(40)Mn_(25)Fe_(25)Cr_(10))_(100-x)Ga_(x)(x=0,5,10)series high-entropy alloy was designed,cold-rolled and annealed,and the tensile properties were tested.The morphology and fracture of the alloy were characterized by scanning electron microscope,and the phase composition of the alloy was studied by X-ray diffraction method.The results show that the addition of Ga enriches Ni,Mn and Ga at the grain boundaries,and then the L1;phase precipitated and formed which effectively enhances the strength of the alloy,but reduces the plasticity of the alloy.The addition of Ga also enhances the corrosion resistance of the alloy.The main strengthening method of the aging state is precipitation strengthening.After annealing at 750℃,(Ni_(40)Mn_(25)Fe_(25)Cr_(10))_(90)Ga_(10) has higher tensile strength and lower reduction in plasticity than(Ni_(40)Mn_(25)Fe_(25)Cr_(10))_(95)Ga_(5) at the same temperature.
作者
朱笛
何美凤
ZHU Di;HE Mei-feng(School of Materials Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2021年第11期173-180,共8页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(51771120)。
关键词
高熵合金
析出强化
微观组织
力学性能
high-entropy alloy
precipitation strengthening
microstructure
mechanical properties
