摘要
设计并通过铸造方法制备了(Cu_(35)Ni_(35)Co_(30))_(85)Mn_(10)Al_(5)和(Cu_(35)Ni_(35)Co_(30))_(85)Mn_(8)Al_(7)两种多主元合金,研究了其铸态和均匀态的相组成、微观组织与力学性能。结果表明,铸态合金均为双相FCC结构,微观组织为典型的树枝晶组织,其中枝晶为富Ni-Co-Al相、枝晶间为富Cu相。(Cu_(35)Ni_(35)Co_(30))_(85)Mn_(10)Al_(5)和(Cu_(35)Ni_(35)Co_(30))_(85)Mn_(8)Al_(7)合金的室温拉伸性能较好,屈服强度、抗拉强度、伸长率分别为238和251 MPa,500和530 MPa,45.1%和43.1%。与基体Cu_(35)Ni_(35)Co_(30)合金相比,两种合金的伸长率分别提升了24倍和23倍。经均匀化处理后,两种合金的成分均匀,得到单相FCC固溶体,但强塑性较铸态均有所下降。均匀态合金屈服强度下降的原因是晶粒粗化和树枝晶组织消失,塑性降低与Al、Mn元素造成的晶格畸变及Mn元素的强化学活性有关。
(Cu_(35)Ni_(35)Co_(30))_(85)Mn_(10)Al_(5)and(Cu_(35)Ni_(35)Co_(30))_(85)Mn_(8)Al_(7)multi-principal-element alloys(MPEA)were designed and fabricated,and the phase composition,microstructure and mechanical properties of as-cast and homogenized alloys were investigated.The results indciate that as-cast alloy is composed of dual FCC solid-solution phases,and the microstructure is characterized by dendrite structure,in which the dendrite is Ni-Co-Al rich phase and the interdendriticis Cu-rich phase.(Cu_(35)Ni_(35)Co_(30))_(85)Mn_(10)Al_(5)and(Cu_(35)Ni_(35)Co_(30))_(85)Mn_(8)Al_(7)alloys exhibit desirable tensile properties at room temperature,with yield strength of 238 MPa and 251 MPa,tensile strength of 500 MPa and 530 MPa,and elongation of 45.1%and 43.1%.Compared with Cu_(35)Ni_(35)Co_(30)alloy,the elongation of the MPEA is increased by 24 times and 23 times,respectively.After homogenizing treatment,the composition of MPEA is uniform,and the single-FCC solid solution is generated,while the strength plasticity is lower than that of as-cast ones.The reduction of yield strength is attributed to grain coarsening and disappearance of dendrite structure,and the reduction of plasticity is related to the lattice distortion caused by Al and Mn elements and the strong chemical activity of Mn elements.
作者
朱成圆
张俊
柳俊晨
杨志勇
陈维平
Zhu Chengyuan;Zhang Jun;Liu Junchen;Yang Zhiyong;Chen Weiping(Guangdong Key Laboratory for Advanced Metallic Materials Processing,College of Mechanical and Automotive Engineering,South China University of lechnology;Chongqing Military Representative Bureau)
出处
《特种铸造及有色合金》
CAS
北大核心
2023年第9期1240-1245,共6页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金青年基金资助项目(52103360)
广东省重点领域研发计划资助项目(2018B090905002)。
关键词
多主元合金
显微组织
力学性能
Multi-principal-element Alloys
Microstructure
Mechanical Properties
