Tribological and impact fatigue behaviors of pure titanium treated by plasma Ni alloying

Tribological and impact fatigue behaviors of pure titanium treated by plasma Ni alloying
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等离子镍合金化纯钛的摩擦学和冲击疲劳行为

DOI:
10.1007/s11595-012-0479-2
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发表时间:
2012-06
影响因子:
1.6
通讯作者:
Tang Bin
Tang Bin
中科院分区:
材料科学4区
文献类型:
--
作者:
Wang Zhenxia;He Zhiyong;Wang Yingqin;Liu Xiaoping;Tang Bin

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采用等离子表面合金化技术在纯钛表面制备Ni改性层。分析了Ni改性层的表面形貌、显微组织形貌、成分分布、相结构和显微硬度。采用Pin-on-disc摩擦磨损试验机和重复冲击试验观察了纯钛Ni改性层的摩擦学性能和疲劳行为。结果表明,Ni改性层表面平均Ni浓度接近18%,由TiNi、Ti2Ni和Ti相组成。 Ni改性层的最大表面显微硬度约为580 HV,几乎是基体硬度的两倍。 Ni改性层的耐磨性明显提高。 Ni改性层的磨损机理表现为轻微磨粒磨损,而纯钛则表现为磨粒磨损和粘着磨损。 Ni改性层具有更好的冲击疲劳强度。
Ni modified layer is prepared on the surface of pure titanium by plasma surface alloying technique. Surface appearance, micro-structure morphology, composition distribution, phase structure and microhardness of Ni modified layer are analyzed. Tribological performance and fatigue behaviors of Ni modified layer of pure titanium are observed using Pin-on-disc tribometer and repeated impact test. The results indicate that the surface mean Ni concentration of Ni modified layer is nearly 18% which is composed of TiNi, Ti2Ni and Ti phase. The maximum surface microhardness of Ni modified layer is approximately 580 HV which is almost two-fold of the hardness of the substrate. The wear resistance of Ni modified layer is improved obviously. The wear mechanism of Ni modified layer shows slight abrasion wearing, while pure titanium is abrasion and adhesion wearing. Ni modified layer presents better impact fatigue strength.
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