## Electronic Theses and Dissertations

1995

Thesis

M.A.Sc.

#### Department

Mechanical, Automotive, and Materials Engineering

Alpas, A. T.

#### Keywords

Engineering, Materials Science.

CC BY-NC-ND 4.0

#### Abstract

Aluminum matrix composites, with high strength and high thermal stability, are replacing cast iron in automotive engine and brake components where temperature exceeds 200$\sp\circ$C. Intermetallic materials are designated high temperature materials and considerable progress has been made in improving their ductility. Thus two materials, representing each class of materials with potential tribological application prospects, have been selected for this work. Sliding wear of Al6061, Al6061-20%Al$\rm\sb2O\sb3$ and $\rm Ti\sb{50}Ni\sb{47}Fe\sb3$ was studied in the temperature range 25-520$\sp\circ$C against a SAE52100 steel counterface. A new wear machine was constructed to operate in the temperature range 25-1000$\sp\circ$C. Both wear rates and coefficient of friction ($\mu$) were measured. Detailed analysis of wear debris and worn materials was carried out. The effect of an increase in temperature was similar for all the three materials investigated. The wear rates decreased with temperature up to a critical temperature above which the wear rates increased sharply. At low temperatures, formation of iron rich layers on the sliding surfaces and solid lubrication by the steel wear debris, both helped to decrease the wear rates and $\mu.$ At high temperatures, low flow strength and loss of work hardening ability resulted in extensive damage to sliding surface as a result of gross plastic deformations and macroscopic material transfer to the counterface. (Abstract shortened by UMI.) Source: Masters Abstracts International, Volume: 34-02, page: 0851. Adviser: A. T. Alpas. Thesis (M.A.Sc.)--University of Windsor (Canada), 1995.

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