【作者】 邹军涛； 石浩； 李涛； 王献辉； 梁淑华；

【Author】 ZOU Juntao;SHI Hao;LI Tao;WANG Xianhui;LIANG Shuhua;Key Laboratory of Electrical Materials and Infiltration Technology Shaanxi Province,School of Materials Science and Engineering,Xi’an University of Technolog;

【机构】 西安理工大学材料科学与工程学院陕西省电工材料与熔渗技术重点实验室；

【摘要】 为了细化晶粒,弱化树枝晶尺寸以及获得力学性能良好的CuNiMnFe合金,采用真空感应熔炼制备了Fe含量0%~7.5%(质量分数)的CuNiMnFe合金,并采用固溶处理和时效处理进行强化。通过扫描电镜(SEM)、透射电镜(TEM)、能谱仪(EDS)及X射线衍射仪(XRD)对合金组织形貌及物相分布进行表征分析,并利用布氏硬度计检测合金硬度,采用材料力学试验机测试合金强度等力学性能。结果表明:随着Fe含量增加,CuNiMnFe合金组织中树枝晶得到细化,一次枝晶臂变短,铸态CuNiMnFe合金硬度、抗拉强度及伸长率增加。经过固溶处理及时效处理后,CuNiMnFe合金中产生颗粒状析出相,合金的硬度和抗拉强度显著提高,硬度最高达335HB,抗拉强度最高为889 MPa,但合金断裂机制由韧性断裂转变为脆性断裂。更多还原

【Abstract】 In order to refine the grain size and dendrite weakening of CuNiMnFe alloy with good mechanical properties,the content of Fe 0%-7.5%(mass fraction) CuNiMnFe alloy prepared by vacuum induction melting process,and the use of solid solution treatment and aging treatment were enhanced.By scanning electron microscopy(SEM),transmission electron microscope(TEM),energy dispersive spectrometer(EDS) and X-ray diffractometer(XRD) on the microstructure morphology and phase distribution were analyzed.And the Brinell hardness test the hardness of the alloy,the mechanical properties such as strength of the alloy were measured by the mechanical testing machine.The results show that with the increase of Fe content,dendritic microstructure in CuNiMnFe alloy is refined and the second dendrite arm becomes shorter,the hardness of cast CuNiMnFe alloy,the tensile strength and elongation increase.After solution treatment and aging treatment,generate granular precipitation in CuNiMnFe alloy,the hardness and tensile strength of the alloy increased,the hardness of up to 335 HB,the maximum tensile strength of 889 MPa alloy,but the fracture mechanism by the change from ductile fracture to brittle fracture.更多还原