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Heating systems for warm compaction
Literature Pressing Fundamentals Aluminium Iron and steel Magnesium Molybdenum Nickel Vanadium Ceramics Coatings Composite materials Electrical and magnetic materials Hard materials and tool steels Intermetallic materials
p. 30 p. 30 P. 30 p. 30 p. 30 p. 30 p. 32 P. 32 p. 32 p. 32 p. 32 P, 32 p. 32 P. 32
For copies of full papers you are recommended to contact individual authors, use the Interlibrary Loan
Pressing Densification of mixtures of hard and soft particles under pressure D.Bouvard. (National Polytechnical Inst. of Grenoble, St.Martin d'H~res, France.) Powder Technol., Vol 111, No 3, 2000, 231-239.
Densification of mixtures of hard and soft powder mixtures was investigated with regard to powder and mixture characteristics and magnitude of applied pressure. At low pressures densification is mainly due to particle rearrangement and is favoured by a high proportion of hard particles. Where there is soft powder deformation a high fraction of hard particles hinders densification to an extent dependent on distribution of the hard particles, including clustering and isolation of individual particles.
Heating systems for warm compaction Y-Y. Li et al. (South China University of Technology, Guangzhou, China.) Powder Metall. Industry,Vol; IO, No 6, 2000, 14-18. (In Chinese.)
The importance of correct heating methods fc~r warm compaction, and the need for precision in control of temperature, are emphasized. Some available systems are reviewed.
3o
MPR
September2001
Literature.
review
Fundamentals
Iron and steel
Measurement of mean particle size using tomography
Microstructure and deformation of nanocrystalline iron-silver
M.Lech et al. (Technical University of Wroclaw, Wroclaw, Poland.) Powder Technol., Vol 111, No 3, 2000, 186-191.
S.Ichikawa et al. (University of Tokyo, Tokyo, Japan.) J. Jpn Soc. Powder/Powder Metall., Vol 47, No 4, 2000,
The need for automatic devices for continuous measurement of particle size is noted. The dependence of bulk density of a bed of powder on particle size was determined from a model. This was used as the basis of a radio-isotope device for continuous measurement of dispersion. Laboratory and industrial tests are described.
Nanostructured Fe-Ag alloys were compacted from inert gas condensed powders and hot rolled to investigate defon'aation mechanisms by electron microscopy and X-ray diffraction. Ag and Fe-Ag did not show dislocation tangles but developed preferred orientations and there was some grain growth. The dominant mechanism is shown to be grain boundary sliding.
Aluminium
Magnesium
Microstructure and properties of aluminium-nickel deposited by electron beam methods
Mechanical alloying and pulsed current sintering of amorphous magnesium alloy
A.lnoue et al. (Tohoku University, Sendai, Japan.) J. Jpn Soc. Powder/PowderMetall., Vo147, No 4, 2000, 406411. (In Japanese.)
T.Nishio et al. (National Industrial Research Inst., Nagoya, Japan.) J. Jpn Soc. Powder/PowderMetall.,Vol 47, No 4, 2000, 423-426. (In Japanese.)
Nanostructured A1-Ni alloys were fabricated by electron beam evaporation and condensation. Structures and properties were investigated. The deposits contained A13Ni. Vickers hardness increased with %Ni to a maximum of 320 at 20at%Ni. There was a decrease in hardness and amount of A13Ni on heat treatment. The method is considered to be suitable for making this material.
Amorphous Mg-Ni-Y alloys were prepared by mechanical alloying and pulsed electric current sintering. Structures and corrosion resistance were investigated. Corrosion properties were better than Mg or AZ91 Mg alloy.
Structure and properties of melt quenched aluminium alloys A.Inoue et al. (Tohoku University, Sendai, Japan.) J. Jpn Soc. Powder/PowderMetall., Vo147, No 4, 2000, 417422. (In Japanese.)
Samples of A1-Fe-Ti-(V, Cr and/or Mn) were prepared from gas atomized powders and by melt spinning to ribbon. The ribbon consisted of A1 and amorphous phases. The PM alloy had an A1 matrix with quasi-crystalline phases. The dispersed phases decomposed at 467 °C. Mechanical properties were: 0.2% proof stress, 530 MPa; tensile strength, 650 MPa; 4.4% elongation; Young's modulus, 86 GPa; and Vickers hardness, 190.
412-416. (In Japanese.)
Molybdenum Oxide dispersion strengthened Mo and Mo-Re R.W.Buckman et al. (Refractory Metals Technology, Pittsburg, USA.) Int. J. Refract. Metals Hard Mater., Vo118. No 4-5, 2000, 205-211.
Mo based materials were discussed with regard to oxide dispersion strengthening and ductile/brittle transition temperatures, which may be above ambient temperature in recrystallized alloys. The effects on transition temperatures of additions of 7 or 14%Re to dispersion strengthened Mo were assessed. 7%Re had little effect on mechanical properties. 14%Re reduced the transition temperature to below ambient, for stress relieved and recrystallized states, and increased tensile strength, compared with ODS Mo.
oo26-o657/m/$- seefrontmatter© 2ooi ElsevierScienceLtd.All rightsreserved.
p. 30 p. 30 P. 30 p. 30 p. 30 p. 30 p. 32 P. 32 p. 32 p. 32 p. 32 P, 32 p. 32 P. 32
For copies of full papers you are recommended to contact individual authors, use the Interlibrary Loan
Pressing Densification of mixtures of hard and soft particles under pressure D.Bouvard. (National Polytechnical Inst. of Grenoble, St.Martin d'H~res, France.) Powder Technol., Vol 111, No 3, 2000, 231-239.
Densification of mixtures of hard and soft powder mixtures was investigated with regard to powder and mixture characteristics and magnitude of applied pressure. At low pressures densification is mainly due to particle rearrangement and is favoured by a high proportion of hard particles. Where there is soft powder deformation a high fraction of hard particles hinders densification to an extent dependent on distribution of the hard particles, including clustering and isolation of individual particles.
Heating systems for warm compaction Y-Y. Li et al. (South China University of Technology, Guangzhou, China.) Powder Metall. Industry,Vol; IO, No 6, 2000, 14-18. (In Chinese.)
The importance of correct heating methods fc~r warm compaction, and the need for precision in control of temperature, are emphasized. Some available systems are reviewed.
3o
MPR
September2001
Literature.
review
Fundamentals
Iron and steel
Measurement of mean particle size using tomography
Microstructure and deformation of nanocrystalline iron-silver
M.Lech et al. (Technical University of Wroclaw, Wroclaw, Poland.) Powder Technol., Vol 111, No 3, 2000, 186-191.
S.Ichikawa et al. (University of Tokyo, Tokyo, Japan.) J. Jpn Soc. Powder/Powder Metall., Vol 47, No 4, 2000,
The need for automatic devices for continuous measurement of particle size is noted. The dependence of bulk density of a bed of powder on particle size was determined from a model. This was used as the basis of a radio-isotope device for continuous measurement of dispersion. Laboratory and industrial tests are described.
Nanostructured Fe-Ag alloys were compacted from inert gas condensed powders and hot rolled to investigate defon'aation mechanisms by electron microscopy and X-ray diffraction. Ag and Fe-Ag did not show dislocation tangles but developed preferred orientations and there was some grain growth. The dominant mechanism is shown to be grain boundary sliding.
Aluminium
Magnesium
Microstructure and properties of aluminium-nickel deposited by electron beam methods
Mechanical alloying and pulsed current sintering of amorphous magnesium alloy
A.lnoue et al. (Tohoku University, Sendai, Japan.) J. Jpn Soc. Powder/PowderMetall., Vo147, No 4, 2000, 406411. (In Japanese.)
T.Nishio et al. (National Industrial Research Inst., Nagoya, Japan.) J. Jpn Soc. Powder/PowderMetall.,Vol 47, No 4, 2000, 423-426. (In Japanese.)
Nanostructured A1-Ni alloys were fabricated by electron beam evaporation and condensation. Structures and properties were investigated. The deposits contained A13Ni. Vickers hardness increased with %Ni to a maximum of 320 at 20at%Ni. There was a decrease in hardness and amount of A13Ni on heat treatment. The method is considered to be suitable for making this material.
Amorphous Mg-Ni-Y alloys were prepared by mechanical alloying and pulsed electric current sintering. Structures and corrosion resistance were investigated. Corrosion properties were better than Mg or AZ91 Mg alloy.
Structure and properties of melt quenched aluminium alloys A.Inoue et al. (Tohoku University, Sendai, Japan.) J. Jpn Soc. Powder/PowderMetall., Vo147, No 4, 2000, 417422. (In Japanese.)
Samples of A1-Fe-Ti-(V, Cr and/or Mn) were prepared from gas atomized powders and by melt spinning to ribbon. The ribbon consisted of A1 and amorphous phases. The PM alloy had an A1 matrix with quasi-crystalline phases. The dispersed phases decomposed at 467 °C. Mechanical properties were: 0.2% proof stress, 530 MPa; tensile strength, 650 MPa; 4.4% elongation; Young's modulus, 86 GPa; and Vickers hardness, 190.
412-416. (In Japanese.)
Molybdenum Oxide dispersion strengthened Mo and Mo-Re R.W.Buckman et al. (Refractory Metals Technology, Pittsburg, USA.) Int. J. Refract. Metals Hard Mater., Vo118. No 4-5, 2000, 205-211.
Mo based materials were discussed with regard to oxide dispersion strengthening and ductile/brittle transition temperatures, which may be above ambient temperature in recrystallized alloys. The effects on transition temperatures of additions of 7 or 14%Re to dispersion strengthened Mo were assessed. 7%Re had little effect on mechanical properties. 14%Re reduced the transition temperature to below ambient, for stress relieved and recrystallized states, and increased tensile strength, compared with ODS Mo.
oo26-o657/m/$- seefrontmatter© 2ooi ElsevierScienceLtd.All rightsreserved.