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Microstructures of electroless Ni-P alloy deposits and their transformation sequences during post-deposition annealing

机译：Ni-P合金化学沉积沉积后的显微组织及其相变顺序

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摘要

Ni-P deposits of amorphous, nanocrystalline, and mixed structures were prepared by electroless deposition. The three deposits were hypoeutectic Ni-P alloys with different P concentrations. The overall transformation sequences of the deposits during post-deposition annealing were investigated using differential scanning calorimetry, x-ray diffraction, and transmission electron microscopy. It was found that there existed three heat-release peaks in a mixed-structure deposit during annealing. The first peak came from the precipitation of Ni nanocrystallites from an amorphous matrix, the second peak resulted from the decomposition of the retained amorphous matrix into Ni + Ni_3P having a composition close to the eutectic point, and the third peak, newly found in hypoeutectic Ni-P alloys, was assumed to be caused by both grain growth and the precipitation of Ni_3P from as-deposited supersaturated Ni(P) nanocrystals interspersed within the amorphous matrix. By comparing the transformation sequences of the amorphous deposit with that of the nanocrystalline deposits, it was concluded that the transformation sequence of the mixed-structure deposit was a superimposition of those of both the amorphous and nanocrystalline deposits.
机译：通过无电沉积制备非晶，纳米晶体和混合结构的Ni-P沉积物。这三个沉积物是具有不同P浓度的亚共晶Ni-P合金。使用差示扫描量热法，X射线衍射和透射电子显微镜研究了沉积后退火过程中沉积物的总体转变顺序。发现在退火过程中混合结构沉积物中存在三个放热峰。第一个峰是从非晶态基质中析出的镍纳米晶体，第二个峰是由于保留的无​​定形基质分解成组成接近共晶点的Ni + Ni_3P而形成的，第三个峰是在亚共晶的Ni中新发现的。 -P合金被认为是由晶粒生长和散布在非晶基质中的沉积态过饱和Ni（P）纳米晶体的Ni_3P沉淀引起的。通过比较非晶态沉积物和纳米晶沉积物的转变顺序，可以得出结论，混合结构沉积物的转变顺序是非晶态和纳米晶沉积物的转变顺序的叠加。

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  • 来源
    《Journal of Materials Research》 |2008年第5期|p.1343-1349|共7页
  • 作者

    Y. Gao; Z.J. Zheng; M.Q. Zeng; C.P. Luo; M. Zhu;

  • 作者单位

    School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
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