Hot deformation in dispersion strengthened aluminum alloys and composites

Abstract Hot forming and superplasticity in powder metallurgy aluminum alloys and composites is reviewed. The effects of alloy composition, particulate composition, size, and size distribution is summarized. The role of climb distance for recovery is described in connection with the size of strengthening phases. In materials with fine strengthening phases on the order of one micron or less, high strain rate superplastic deformation processes are likely. However, the quality of superplastic deformation depends on the prior processing history, and these effects are reviewed. Very few data describing the effects of hot forming history on post-forming properties exist, but some results emerging in the literature are compared.
Keywords: Metallurgy, Aluminum alloys, Powder metallurgy, Metal matrix composites, Hot working, Superplasticity, Post-forming properties.
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Summary: The selection of the production rate is one of the most crucial decisions to be made in the development of a mineral property. However, it is not uncommon for the production rate to be decided arbitrarily, before any technical evaluations begin, and it is often not reconsidered when better data becomes available. A number of methods are used in the mineral industry to select the production rate for a project. There is general agreement that the size of the ore reserve has a strong influence...
Publication: CIM Bulletin
Author(s): Lawrence Devon Smith
Keywords: Mineral economics, Production rates, Optimum production rates.
Issue: 1007
Volume: 90
Year: 1997
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Summary: The effect of extended ball milling has been studied for two industrial processes: (1) the processing of metal sulphide concentrates; and (2) the carbothermic reduction of ilmenite to synthetic rutile. The plant concentrates were a gold ore with 128 g/t Au of which 8% was non-refractory and a zinc concentrate with copper impurities.
The gold concentrate showed complete dissolution of the gold bearing minerals after milling giving almost complete gold liberation. The zinc concentrate showed...
Publication: CIM Bulletin
Author(s): Nicholas J. Welham
Keywords: Mineral processsing, Extended ball milling, Milling.
Issue: 1007
Volume: 90
Year: 1997
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Summary: Niobec mine, a producer of pyrochlore concentrates since 1976, became a producer of ferroniobium in 1994 and achieved accreditation to the ISO 9002 standard in 1995. The goal of ISO 9002 is to ensure that the products supplied to clients regularly meet their specifications, through explicit work standards and procedures throughout the production process, from deposit appraisal to ferroniobium production. A key element of ISO 9002 implementation at Niobec consists of the quality control...
Publication: CIM Bulletin
Author(s): Denis Villeneuve, Eddy Dénommé
Keywords: Geology, Exploration, ISO 9002, Niobec Mine.
Issue: 1007
Volume: 90
Year: 1997
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