Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 20    No. 3    March 2010

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Friction and wear of 7075 aluminum alloy induced by torsional fretting
CAI Zhen-bing(蔡振兵), ZHU Min-hao(朱旻昊), LIN Xiu-zhou(林修洲)

Tribology Research Institute, Traction Power State Key Laboratory, Southwest Jiaotong University,
Chengdu 610031, China

Abstract:The torsional fretting wear tests of 7075 aluminum alloy flat against 52100 steel ball in dry condition were carried out on a new high-precision torsional fretting-wear tester. The kinetics behaviors and damage mechanism of 7075 aluminum alloy under different angular displacement amplitudes were investigated in detail. The results show that the torsional fretting running behaviors of 7075 aluminum alloy can be defined by three fretting regimes (i.e. partial slip regime (PSR), mixed fretting regime (MFR) and slip regime (SR)) with the increase of angular displacement amplitudes. In PSR, the damage occurs at the lateral portion of the contact zone with a slight annular shape. However, in MFR and SR, more severe damages are observed and the debris layer covers the wear scars. Friction torque and dissipation energy which are strongly dependent upon the imposed angular displacement amplitudes and presented in three stages were discussed in detail. The mechanisms of torsional fretting wear of aluminum alloy are mainly oxidative wear, abrasive wear and delamination in the three fretting regimes. In addition, the oxidative debris plays an important role during the torsional fretting wear processes.


Key words: 7075 aluminum alloy; fretting wear; torsional fretting; fretting regime

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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