An Alternative Route to the Consolidation of Mechanically Alloyed Aluminum Powder
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In this article, a new processing route for the consolidation of mechanically alloyed aluminum powder has been investigated, where attrition milled and degassed powder was processed by a fairly conventional PM method consisting of a double cycle of cold pressing and vacuum sintering.Abstract:
A new processing route for the consolidation of mechanically alloyed aluminum powder has been investigated. The attrition milled and degassed powder was processed by a fairly conventional PM method consisting of a double cycle of cold pressing and vacuum sintering. A systematic series of experiments were conducted to find optimum values of compaction pressures and sintering temperatures. The final consolidated compacts have relative densities and mechanical properties comparable to those obtained using well-established hot-working processes. In addition, this method allows the elimination of the degassing heat-treatment step. Improvements in ductility are achieved by using purer aluminum powder.read more
Citations
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Journal ArticleDOI
Dry and lubricated wear resistance of mechanically-alloyed aluminium-base sintered composites
M.D. Bermúdez,Ginés Martínez-Nicolás,F.J. Carrión,I. Martínez-Mateo,Jose A. Rodriguez,E. J. Herrera +5 more
TL;DR: In this article, the friction and wear behaviour of three mechanically alloyed aluminium-base materials, consolidated by an alternative powder-metallurgy process, was studied with a pin-on-disk tribometer, sliding against AISI 52100 steel pins.
Journal ArticleDOI
Sintering of Al/AlN composite powder obtained by gas–solid reaction milling
TL;DR: In this paper, the authors used attrition milling in ammonia gas to obtain aluminum composite powder by partial nitriding of Al powder, which is very hard, thermally stable and shows excellent sinterability.
Journal ArticleDOI
High-strength PM aluminium by milling in ammonia gas and sintering
TL;DR: High-strength Al has been produced by attrition milling in ammonia gas atmosphere and powder consolidation by cold pressing and sintering as discussed by the authors, which has a high tensile strength (515 MPa) and its high-temperature behaviour is outstanding.
Journal ArticleDOI
Influence of milling conditions on the wear resistance of mechanically alloyed aluminium
M.D. Bermúdez,Francisco J. Carrión,Patricia Iglesias,Ginés Martínez-Nicolás,E. J. Herrera,Jose A. Rodriguez +5 more
TL;DR: In this paper, the tribological behaviour of mechanically alloyed (MA) aluminium base materials has been studied as a function of processing conditions, and wear mechanisms are discussed from SEM observation of wear tracks, wear debris, transfer tribolayers and EDS analysis.
Journal ArticleDOI
Influence of milling media on the microstructure and mechanical properties of mechanically milled and sintered aluminium
TL;DR: In this article, two types of milling balls (steel or hard-metal balls) were employed, and powder consolidation was carried out by cold pressing and vacuum sintering.
References
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TL;DR: The mechanical alloying process as mentioned in this paper is an entirely solid state process, permitting dispersion of insoluble phases such as refractory oxides and addition of reactive alloying elements such as aluminum and titanium.
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TL;DR: In this article, the authors describe a dry, high energy ball milling process for producing composite metal powder with a fine controlled microstructure, which was originally developed to make high temperature alloys combining oxide dispersion and intermetallic compound strengthening.
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TL;DR: In this article, a steady state processing conditions, characterized by equiaxed powder particles, a constant particle size distribution and a saturation hardness, was found to depend on the size distribution of the initial powders.
Patent
Mechanically-alloyed aluminum-aluminum oxide
TL;DR: A mechanically alloyed composite powder wherein individual particles include an aluminum matrix having equiaxed aluminum oxide dispersoid particles having a size of about 100A to 2,000A uniformly distributed therethrough at particle spacings of about 500 to 3,000 A as mentioned in this paper.
Journal ArticleDOI
Identification of dispersoid phases created in aluminum during mechanical alloying
TL;DR: In this paper, the high strength of the mechanically alloyed aluminum is due to a dispersion of both γ-Al2O3 and Al4C3 particles with sizes of the order of 10 nm.