程露,王亚强,张金钰,刘刚,孙军.合金化效应对Ni-W镀层力学性能的影响[J].稀有金属材料与工程,2021,50(1):145~152.[Cheng Lu,Wang Yaqiang,Zhang Jinyu,Liu Gang,Sun Jun.Effect of Microalloying Addition on Mechanical Properties of Ni-W Coating[J].Rare Metal Materials and Engineering,2021,50(1):145~152.]
合金化效应对Ni-W镀层力学性能的影响
投稿时间:2019-12-30  修订日期:2020-06-05
中文关键词:  合金化  Ni-W镀层  微观组织  力学性能
基金项目:中国博士后科学基金,国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:
      本文通过研究微量合金元素W添加(< 2.0 at.%)对电沉积Ni-W镀层表面形貌、微观组织和力学性能的影响,探索了材料制备工艺与微合金化对改善Ni-W镀层组织、进一步提高力学性能的内在机制。结果表明,Ni-W镀层为单相FCC结构,随着W含量的增加,镀层表面形貌从粗大的棱锥界面沟槽转变为均匀分布的微孔,同时表面粗糙度和晶粒尺寸逐渐减小,且镀层中Ni(220)衍射峰的强度也逐渐减弱;而镀层的屈服强度在1.0 at.%W含量左右发生突增,从~1.0 GPa增长到~2.0 GPa,拉伸延伸率却没有明显变化。此外,Ni-W镀层具有比较稳定的应变硬化能力,基本不随合金元素含量而变化。本文通过微合金化对表面形貌和微观组织的调控,实现了低W含量Ni-W合金镀层的力学性能优化。
Effect of Microalloying Addition on Mechanical Properties of Ni-W Coating
英文关键词:Alloying  Ni-W coating  Microstructures  Mechanical properties
英文摘要:
      This manuscript focused on the effect of processing technology and microalloying addition on the microstructure and mechanical properties of Ni-W coatings that were prepared by electrodeposition. For this reason, the surface morphology, microstructure, and tensile properties of Ni-W coatings were studied within a small W addition of less than 2.0 at.%. The experimental results showed that the Ni-W coatings have a single-phase FCC structure. By increasing the W content, the surface morphology of the coatings varied from the grooves between the coarse pyramid structures to uniformly distributed micropores. At the same time, the intensity of Ni(220) diffraction peak of the coatings also gradually weakened, with the surface roughness and the grain size reduced. There was a critical W addition of about 1.0 at.%, where the yield strength of Ni-W coating increased from ~ 1.0 GPa at the W addition regime <1.0 at.% sharply to ~ 2.0 GPa at the W addition regime >1.0 at.%. However, the tensile elongation was insensitive to the W content, which kept almost unchanged within the studied W addition range. In addition, strain hardening capacity of the coatings was also stable with the W content. In this work, the mechanical properties of Ni-W coating with micro-addition of W were optimized through manipulation of microalloying effect on the surface morphology and microstructure.
作者单位E-mail
程露 西安交通大学 chenglu_95@126.com 
王亚强 西安交通大学 yaqiangwang@xjtu.edu.cn 
张金钰 西安交通大学  
刘刚 西安交通大学  
孙军 西安交通大学  
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