CAJ | 학술논문

采用脉冲电沉积方法，通过改变Fe含量获得不同层错能的纳米晶Ni-Fe合金。采用X射线衍射(XRD)、透射电镜(TEM)与拉伸试验研究纳米晶Ni-Fe合金的显微组织和力学性能。结果表明：制备的Ni-Fe合金均为面心立方结构的单相固溶体，平均晶粒尺寸为12~25 nm，且平均晶粒尺寸随层错能的减小而减小。纳米晶Ni-Fe合金抗拉强度为1361~1978 MPa，断裂伸长率为9.3%~13.2%，纳米晶Ni-Fe合金的抗拉强度和断裂伸长率均随层错能的减小而增加。合金抗拉强度的增加是细晶强化作用的结果。随着Ni-Fe合金层错能的降低，加工硬化率提高，塑性失稳被推迟，从而获得较高的塑性。
채용맥충전침적방법，통과개변Fe함량획득불동층착능적납미정Ni-Fe합금。채용X사선연사(XRD)、투사전경(TEM)여랍신시험연구납미정Ni-Fe합금적현미조직화역학성능。결과표명：제비적Ni-Fe합금균위면심립방결구적단상고용체，평균정립척촌위12~25 nm，차평균정립척촌수층착능적감소이감소。납미정Ni-Fe합금항랍강도위1361~1978 MPa，단렬신장솔위9.3%~13.2%，납미정Ni-Fe합금적항랍강도화단렬신장솔균수층착능적감소이증가。합금항랍강도적증가시세정강화작용적결과。수착Ni-Fe합금층착능적강저，가공경화솔제고，소성실은피추지，종이획득교고적소성。
Nanocrystalline Ni-Fe alloys with different stacking fault energies were prepared by changing Fe content using pulse electrodeposition method. The microstructure and mechanical properties of the nanocrystalline Ni-Fe alloys were characterized by XRD, TEM and tensile testing. The results indicate that all the prepared Ni-Fe alloys are face-centered cubic structure, single-phase solid solution with the average grain size in the range of 12?25 nm, and the average grain size decreases with decreasing the stacking fault energy. The ultimate tension strength of the nanocrystalline Ni-Fe alloys is in the range of 1361?1978 MPa and the elongation to failure is in the range of 9.3%?13.2%. Both the ultimate tension strength and the elongation to failure increase with decreasing stacking fault energy. The increase of tensile strength is due to the fine-grain strengthening. For Ni-Fe alloy, with decreasing the stacking fault energy, the work hardening rate increases, and the plastic instability is delayed, consequently higher plasticity is gained.