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为提高纳米晶镍的显微硬度和抗拉强度,采用脉冲电沉积法制备了不同晶粒尺寸的纳米晶块体镍。利用X射线衍射法分析不同沉积条件的纳米晶镍表面织构和晶粒尺寸。采用超显微微米压痕仪测量表面硬度,利用英斯特朗疲劳试验机进行拉伸试验。结果表明,平均晶粒尺寸为12 nm的纳米晶镍表面显微硬度为598 HV,最大拉伸强度达1360MPa,分别为晶粒尺寸是55 nm的纳米晶镍2.0和1.6倍。另外,晶粒尺寸较小的纳米晶镍伸长率较低。
In order to improve the microhardness and tensile strength of nanocrystalline nickel, nanocrystalline nickel with different grain sizes was prepared by pulse electrodeposition. The surface texture and grain size of nanocrystalline Ni under different deposition conditions were analyzed by X-ray diffraction. The surface hardness was measured by using an ultramicrographic impressometer and the tensile test was conducted by an Instron fatigue tester. The results show that the microhardness of nanocrystalline nickel with an average grain size of 12 nm is 598 HV and the maximum tensile strength is 1360 MPa, which is 2.0 and 1.6 times that of nanocrystalline nickel with a grain size of 55 nm. In addition, nanocrystalline nickel with smaller grain size has lower elongation.