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Nanoscale Dynamic-Mechanical-Analysis Characterization of the Mechanical Behavior and Fatigue Property for Ti Films
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Affiliation:

1.Institute of Surface/Interface Science and Technology,School of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin Heilongjiang;2.National Key Laboratory for Remanufacturing,Academy of Armored Forces Engineering

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Fund Project:

National Natural Science Foundation of China (51535011, 51705095, 51775554), National Basic Research Program of China (973 Program) (No. 61328303), Postdoctoral Scientific Research Developmental Fund of Heilongjiang Province (LBH-Q18036), Natural Science Foundation of Heilongjiang Province (LH2019E031), Fundamental Research Funds for the Central Universities (HEUCF 3072019CF1010).

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    Abstract:

    The mechanical behavior and the fatigue property of Ti films with different thickness were investigated by nanoindentation test. The fatigue property of the films was quantitatively calculated according to the changes of storage stiffness under the nanoscale dynamic mechanical analysis. The results showed that the fatigue life of the films depends on the residual stress remarkably. In situ scanning images showed the thin film was significantly stacked and layered, and long cracks radiated from the center of the indenter perpendicular to the indenter edge. Additionally, there was a sizable pile up around the indentions which demonstrated that a highly localized plastic deformation and stress release occurred in the process of the nanoscale dynamic loading process. The existence of the internal compressive residual stress will offset part of the load stress to improve the fatigue life of films.

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[Jin-na Liu, Hai-dou Wang, Zhi-guo Xing, Bin-shi Xu, Xiu-fang Cui, Guo Jin. Nanoscale Dynamic-Mechanical-Analysis Characterization of the Mechanical Behavior and Fatigue Property for Ti Films[J]. Rare Metal Materials and Engineering,2020,49(6):1938~1945.]
DOI:10.12442/j. issn.1002-185X.20190203

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History
  • Received:March 13,2019
  • Revised:June 24,2019
  • Adopted:June 24,2019
  • Online: July 09,2020
  • Published: