金属系粉体の焼結機構と新しい焼結技術の展開　　非平衡相からなるＭＡ粉末の加圧焼結における相変化の効果

• 磯西 和夫

  滋賀大学教育学部

• 浅野 正浩

  滋賀大学

書誌事項

タイトル別名

• Etfect of Phase Change on Densification Process of MA Powder Having Unstable Phase by Pressure Sintering.
• ヒヘイコウソウ カラ ナル MA フンマツ ノ カアツ ショウケツ ニ オケル ソウヘンカ ノ コウカ

抄録

Effect of phase change from unstable phase to stable phase on densification process by pressure sintering was studied by using mechanically alloyed powders. Powder mixtures of Ti and Si having the composition of Ti-37.5mol%Si were milled for 360ks and 3600ks. The latter powder showed homogeneous microstructure and amorphous-like XRD profile, although the former showed (Ti+Si) lamellar microstructure. Milled powders were vacuum hot pressed at a heating rate of 20 K/min up to 1273 K with applying constant pressure from 10 to 200 MPa, then kept for 10.8 ks. It was observed that the density of compacts increases suddenly at the temperature range between 869K and 900K for 3600ks MAed powder. This temperature range showed good agreement with that of the phase formation from amorphous to Ti₅Si₃. 360 ks MAed powder densified faster during heating stage, however 3600 ks MAed powder obtained higher final density after 10.8 ks holding at 1273 K due to the very fine spherical grains. It is concluded that fine grain superplastic deformation and internal superplastic deformation act an important roll in densification of MA powder having amorphous-like structure.

収録刊行物

• 粉体および粉末冶金

  粉体および粉末冶金 48 (1), 77-81, 2001

  一般社団法人 粉体粉末冶金協会

キーワード

• pressure sintering
• densification behavior
• mechanical alloying
• phase formation
• unstable phase
• superplasticity
• titanium silicide

詳細情報

• CRID: 1390001206308702080
• NII論文ID: 10005139481
• NII書誌ID: AN00222724
• DOI: 10.2497/jjspm.48.77
• ISSN: 18809014
• ISSN: 05328799
• NDL書誌ID: 5648940
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I5648940
• 本文言語コード: ja
• データソース種別:
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