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Effect of tribo-oxide layers on wear properties and coefficient of friction of TC4 alloy in fretting
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1.Lanzhou University of Technology;2.Ningbo University

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    Abstract:

    The gross slip regimes of TC4 alloy against with various counterface materials and temperatures at critical experimental conditions were selected to study the effect of formation of tribo-oxide layers on wear properties and coefficient of friction of TC4 alloy in fretting wear. Results show that irrespective of tribo-pairs, the coefficient of friction of TC4 alloy had undergone periodic evolutions at room temperature, no tribo-oxide layers had been produced on wearing sufaces and the wear rates were higher. When the samples were heated to 260℃, the COF of TC4/GCr15 tribo-pair appeared the earliest transition from a ‘concave-convex’ dynamic to an approximately ‘straight-line’ stable state, the earliest severe-mild wear transition occurred and tribo-oxide layer had generated resulted in the wear rate reduced signigicantly, however, TC4/Si3N4 and TC4/Al2O3 tribo-pairs had no abviously tribo-oxide layers formed, and the wear rate climbed sharply to the maximum value. Severe-mild wear transitions of TC4 alloy against with various counterface materials had occurred while the samples were heated to 450℃, the tribo-oxide layers differed from the matrix were formed on worn surface and the wear rates were lower reaching a minimum value. The excellent of wear properties of TC4 alloy in fretting at elevated temperature is attributed to the generation of a tribo-oxide layers with uniform distribution, continuous compressed and good adhesion. The wear mechanisms of TC4 alloy was dominated by adhesive and abrasive wear before the severe-mild transition, while controlled by oxidative with slightly abrasive wear after the transition beginning.

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[He Yanni, Yu Shurong, Li Shuxin, Chen Qiang. Effect of tribo-oxide layers on wear properties and coefficient of friction of TC4 alloy in fretting[J]. Rare Metal Materials and Engineering,2021,50(4):1417~1424.]
DOI:10.12442/j. issn.1002-185X.20200391

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History
  • Received:June 05,2020
  • Revised:July 16,2020
  • Adopted:July 20,2020
  • Online: May 08,2021
  • Published: