Department of Material Engineering

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About Department of Material Engineering

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Department of Material Engineering has more than 17 academic staff members

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Dr. Misbah Saleh Mohammed Mahfoodh

مصباح محفوظ هو احد اعضاء هيئة التدريس بقسم هندسة مواد ومعادن بكلية الهندسة. يعمل السيد مصباح محفوظ بجامعة طرابلس كـأستاذ منذ وله العديد من المنشورات العلمية في مجال تخصصه

Publications

Some of publications in Department of Material Engineering

Thermo-Mechanical Treatments of Cu-Ti Alloys

Abstract Copper and copper – base alloys are widely used for numerous applications demanding good mechanical properties , resistance to corrosion , good electrical onductivity (EC) , pleasing colour and ease of fabrication [1,2] . Among the alloys having a good combination of high strength and high thermal as well as electrical conductivity, age hardenable Cu-Be alloys are most widly used but they have the limitation of toxicity and high cost of production. Cu- Ti binary alloys are precipitation strengthened by spinodal decomposition mechanism [3-5] involving composition modulations and long range ordering in the initial stages of aging. The tensile strength value of 930N/mm2 was obtained for Cu-5.4wt%Ti alloy by the precipitation of a coherent and metastable fine precipitate of Cu4Ti (β`) and electrical conductivity of 24.5%IACS was obtained for Cu-1.5wt%Ti alloy on peak aging [6]. Experiments on cold compression followed by aging of Cu-Ti alloys have indicated that the most effective hardening of the matertial results from continuous precipitation of very fine particles within the matrix. These particles were reported to be β` -type, Cu4Ti phase. The β`-β transformation and particles coarsening within the matrix as well as a long grain boundaries were responsible for the overaging of Cu-1.5wt%Ti and Cu-3.5wt%Ti alloys It is well know that plate like particles are β – type, Cu3Ti phase. Discontinuous precipitation was found to start at the grain boundaries and expand into grain interior. At the higher aging temperature a classic widmanstätten morphology forms giving rise to a coarse microstructure comprised of α and the equilibrium phase β. Those results were confirmed by X-ray analysis, which found that a few percent of Cu3Ti, β precipitates are formed during aging at high temperature for long time for both Cu- Ti alloys (i.e. Cu-1.5wt%Ti and Cu-3.5wt%Ti).
مريم محمد مرغم (2008)
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