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Powder metallurgy processing of dual-phase iron-aluminium intermetallics
deposition and peeling of diamond films is described. It. is reported that Co particles formed on the substrate surface during deposition which resulted in deposition of non-diamond C. Cracks in films were found to develop during machining of A1-Si. It is shown that substrate surface finish controls film adhesion.
Intermetallic materials EFFECT OF ALUMINIUM ON TENSILE PROPERTIES OF TITANIUM ALUMINIDE MATERIALS WITH MANGANESE M.S. Kim et al. (Sumitomo Light Metal Ind. Ltd, Nagoya, Japan) J. Jupun .!!oc. Powder P@u~derMeta~ll., Vol41, No 5, 1994, 581-587. (In Japanese.) An investigation of the effect of Al content on structure and properties of Ti(40 to 53) at%Al, with Mn at a Mn:Al ratio of 0.04, is described. At 4O%Al a duplex x,-y structure is formed. At 53%Ai only y is present in the structure. The maximum tensile strength was at 43’%Al and the maximum elongation at 45%Al. EFFECT OF TITANIUM POWDER TYPE ON MICROSTRUCTURE OF TITANIUM ALUMINIDE-MANGANESE ALLOYS MS. Kim et al. (Sumitomo Light Metal Ind. Ltd, Nagoya, Japan) J. Jupan Sot. Powder PoujderM&U., 1'0141, NO 5, 1994, 588-594. (In Japanese.) A study of the effect of Ti powder type, Na reduced Ti or Mg reduced hydridedehydride treated Ti powder, on Ti-(49 47.3)at’%;_4-(1.4 to 1.7)%Mn is described. The Mg reduced HDH powder gave a fine uniform microstructure. The Na reduced Ti powder gave a coarse structure low in ductility
d’Heres, France). Acta Metwll. Mater., Vol 43, No 5, 1994, 1799-1809. Mechanical alloying of Fe-,5Oat%Cu was monitored by changes in structure and magnetic properties, Fe is reported to dissolve in Cu after nano-fragmentation. The supersaturated Fe-Cu had a Curie temperature of 207°C. There was phase separation above 227’C by a spinodal reaction. 50% of the Fe rich domains remained face centred cubic.
Metal injection moulding INJECTION MOULDING OF STAINLESS STEEL USING A NOVEL BINDER SYSTEM H.A. Davies et al. (Ilniversity of Sheffield. Sheffield, UK) Pvwder Metall.. Vol37, No 2. 1995, 113-119. Use of a binder comprising polyethyleneglycol (PEG) with a small amount of polymethyl methacrylate (PMMA), to injection mould 316L stainless steel was investigated. Feedstock preparat,ion and characterization were described. Green strength was measured in three point bending. Solvent debinding with water, to remove PEG, and thermal debinding for PMMA were used. After sintering specimens were examined for porosity and cracks. THE TECHNOLOGY AND COMMERCIAL STATUS OF POWDER INJECTION MOULDING A. Bose. J. Metals, Vol47, No 8, 1995, 26-30. Injection moulding of metal and other powders is reviewed with regard to the ability of the technique to combine flexibility of materials selection with the means to make complex shaped parts. It is considered that there will be significant growth in the use of injection moulding
POWDER METALLURGY PROCESSING OF DUAL-PHASE IRON-ALUMINIUM INTERMETALLICS EJ. Lavernia et al. (University of CaliforniaIrvine, Irvine, California, USA), ht. J. Pow der Metall., Vol 31, No 2, 1995, 155-166. It is reported that two Al rich two phase Fe aluminide materials, FeAlg-Fe2Al:r and FeAI,rFezAl:j, had been prepared from atomized powders by hot pressing at 1120°C with additional Al added although there was no residual Al in the structures, Densities of 9676 were attained. Oxidation resistance of the alloys was inferior to cast materials. Indentat,ion hardness toughness was determined at 1.9 MPa.m”.
EURO PM’95. The abstracts which follow are of papers which were presented at the European Conference on Advanced PM Materials which was held in Birmingham, UK, in October 1995.
Structural parts NEAR NET SHAPE PROCESSING OF STRUCTURAL PARTS BY WET POWDER POURING
Mechanical alloying MECHANICAL ALLOYING AND THERMAL DECOMPOSITION OF NANOCRYSTALLINE IRON-COPPER 0. Drbohlav, Polytechnique
A.R. Yavari (Inst. National de Grenoble, St. Martin
40 MPR March 1996
R. Volles et al. (Forschungzentrum Jiilich GmbH, Jiilich, Germany). It is reported that a wet powder pouring technique had been developed and that this had been applied to near net shaping of WC-Co parts. It is shown that by optimization of powder particle size
distribution it had been possible to maximize green and sintered densities. Structure and properties were described. PROPERTIES OF RAPIDLY SOLIDIFIED AND WARM EXTRUDED COPPERCHROMIUM-ZIRCONIUM POWDER H.A. Davies et al. (University of Sheffield, Sheffield, UK) Processing of water atomized Cu1.6wl%Cr-O.lB’%;Zrpowder by cold pressing, warm extrusion and aging heat treatment was investigated with regard to green density and process conditions. Under optimized conditions a tensile strength of 950 MPa and a conductivity of 51% IACS were attained. This is said to compare favourably with conventionally processed Cu-Be-Co alloys. NEW POWDER MIXES TREATED WITH BINDER FOR EFFICIENT COMPACTION D. Barrow, F. Chaghoh (Quebec Metal Powders Ltd, Canada). It was reported that ferrous powders had been coated with polyvinyl pyrrolidine polymer to improve flowability of powders used for warm compaction. This led to improved die filling and shorter cycle times. The technique and process conditions were described. ANALYSIS OF FORGING LIMITS FOR POROUS SINTERED METALS H. Nam et al. (Seoul National University, Seoul, Korea). Forging limit curves for sintered porous metals were calculated using the Lee-Kuhn model. Yield functions were applied to the initial imperfection model. Wben the initial imperfection ratio reaches the initial density the calculations agree well with experimental data. Slope of the forging limit curves was about 0.5. MECHANICAL PROPERTIES AND WEAR OF STAINLESS STEEL MATRIX COMPOSITES F. Velasco et al. (Universidad Jaime I, Castello, Spain.) Investigations of the production of 316L stainless steel matrix composites with particulate Yz03 or Al,O:, were described. Reactive sintering was used to attain near full density. The composites had increased hardness and wear resistance was increased by 50%.
Intermetallic materials STATE OF THE ART OF POWDER METALLURGY OF INTERMETALLICS IN PARTICULAR TITANIUM ALUMINIDES G. Gerling, R. Wagner (GKSS Forschungzentrum, Geesthacht, Germany)
Intermetallic materials EFFECT OF ALUMINIUM ON TENSILE PROPERTIES OF TITANIUM ALUMINIDE MATERIALS WITH MANGANESE M.S. Kim et al. (Sumitomo Light Metal Ind. Ltd, Nagoya, Japan) J. Jupun .!!oc. Powder P@u~derMeta~ll., Vol41, No 5, 1994, 581-587. (In Japanese.) An investigation of the effect of Al content on structure and properties of Ti(40 to 53) at%Al, with Mn at a Mn:Al ratio of 0.04, is described. At 4O%Al a duplex x,-y structure is formed. At 53%Ai only y is present in the structure. The maximum tensile strength was at 43’%Al and the maximum elongation at 45%Al. EFFECT OF TITANIUM POWDER TYPE ON MICROSTRUCTURE OF TITANIUM ALUMINIDE-MANGANESE ALLOYS MS. Kim et al. (Sumitomo Light Metal Ind. Ltd, Nagoya, Japan) J. Jupan Sot. Powder PoujderM&U., 1'0141, NO 5, 1994, 588-594. (In Japanese.) A study of the effect of Ti powder type, Na reduced Ti or Mg reduced hydridedehydride treated Ti powder, on Ti-(49 47.3)at’%;_4-(1.4 to 1.7)%Mn is described. The Mg reduced HDH powder gave a fine uniform microstructure. The Na reduced Ti powder gave a coarse structure low in ductility
d’Heres, France). Acta Metwll. Mater., Vol 43, No 5, 1994, 1799-1809. Mechanical alloying of Fe-,5Oat%Cu was monitored by changes in structure and magnetic properties, Fe is reported to dissolve in Cu after nano-fragmentation. The supersaturated Fe-Cu had a Curie temperature of 207°C. There was phase separation above 227’C by a spinodal reaction. 50% of the Fe rich domains remained face centred cubic.
Metal injection moulding INJECTION MOULDING OF STAINLESS STEEL USING A NOVEL BINDER SYSTEM H.A. Davies et al. (Ilniversity of Sheffield. Sheffield, UK) Pvwder Metall.. Vol37, No 2. 1995, 113-119. Use of a binder comprising polyethyleneglycol (PEG) with a small amount of polymethyl methacrylate (PMMA), to injection mould 316L stainless steel was investigated. Feedstock preparat,ion and characterization were described. Green strength was measured in three point bending. Solvent debinding with water, to remove PEG, and thermal debinding for PMMA were used. After sintering specimens were examined for porosity and cracks. THE TECHNOLOGY AND COMMERCIAL STATUS OF POWDER INJECTION MOULDING A. Bose. J. Metals, Vol47, No 8, 1995, 26-30. Injection moulding of metal and other powders is reviewed with regard to the ability of the technique to combine flexibility of materials selection with the means to make complex shaped parts. It is considered that there will be significant growth in the use of injection moulding
POWDER METALLURGY PROCESSING OF DUAL-PHASE IRON-ALUMINIUM INTERMETALLICS EJ. Lavernia et al. (University of CaliforniaIrvine, Irvine, California, USA), ht. J. Pow der Metall., Vol 31, No 2, 1995, 155-166. It is reported that two Al rich two phase Fe aluminide materials, FeAlg-Fe2Al:r and FeAI,rFezAl:j, had been prepared from atomized powders by hot pressing at 1120°C with additional Al added although there was no residual Al in the structures, Densities of 9676 were attained. Oxidation resistance of the alloys was inferior to cast materials. Indentat,ion hardness toughness was determined at 1.9 MPa.m”.
EURO PM’95. The abstracts which follow are of papers which were presented at the European Conference on Advanced PM Materials which was held in Birmingham, UK, in October 1995.
Structural parts NEAR NET SHAPE PROCESSING OF STRUCTURAL PARTS BY WET POWDER POURING
Mechanical alloying MECHANICAL ALLOYING AND THERMAL DECOMPOSITION OF NANOCRYSTALLINE IRON-COPPER 0. Drbohlav, Polytechnique
A.R. Yavari (Inst. National de Grenoble, St. Martin
40 MPR March 1996
R. Volles et al. (Forschungzentrum Jiilich GmbH, Jiilich, Germany). It is reported that a wet powder pouring technique had been developed and that this had been applied to near net shaping of WC-Co parts. It is shown that by optimization of powder particle size
distribution it had been possible to maximize green and sintered densities. Structure and properties were described. PROPERTIES OF RAPIDLY SOLIDIFIED AND WARM EXTRUDED COPPERCHROMIUM-ZIRCONIUM POWDER H.A. Davies et al. (University of Sheffield, Sheffield, UK) Processing of water atomized Cu1.6wl%Cr-O.lB’%;Zrpowder by cold pressing, warm extrusion and aging heat treatment was investigated with regard to green density and process conditions. Under optimized conditions a tensile strength of 950 MPa and a conductivity of 51% IACS were attained. This is said to compare favourably with conventionally processed Cu-Be-Co alloys. NEW POWDER MIXES TREATED WITH BINDER FOR EFFICIENT COMPACTION D. Barrow, F. Chaghoh (Quebec Metal Powders Ltd, Canada). It was reported that ferrous powders had been coated with polyvinyl pyrrolidine polymer to improve flowability of powders used for warm compaction. This led to improved die filling and shorter cycle times. The technique and process conditions were described. ANALYSIS OF FORGING LIMITS FOR POROUS SINTERED METALS H. Nam et al. (Seoul National University, Seoul, Korea). Forging limit curves for sintered porous metals were calculated using the Lee-Kuhn model. Yield functions were applied to the initial imperfection model. Wben the initial imperfection ratio reaches the initial density the calculations agree well with experimental data. Slope of the forging limit curves was about 0.5. MECHANICAL PROPERTIES AND WEAR OF STAINLESS STEEL MATRIX COMPOSITES F. Velasco et al. (Universidad Jaime I, Castello, Spain.) Investigations of the production of 316L stainless steel matrix composites with particulate Yz03 or Al,O:, were described. Reactive sintering was used to attain near full density. The composites had increased hardness and wear resistance was increased by 50%.
Intermetallic materials STATE OF THE ART OF POWDER METALLURGY OF INTERMETALLICS IN PARTICULAR TITANIUM ALUMINIDES G. Gerling, R. Wagner (GKSS Forschungzentrum, Geesthacht, Germany)