Single crystal growth and its microstructure in Co-Cr-Mo alloys for biomedical applications

Takayoshi Nakano, Keita Sasaki, Koji Hagihara, Takuya Ishimoto, Yusuke Fujii, Ai Serizawa

研究成果: Conference contribution

2 被引用数 (Scopus)

抄録

Co-Cr-Mo based alloys have been widely employed as heat resistant materials and as biomaterials for implants because of their high strength and superior wear resistance. In general, the alloys exhibit a very complicated composition-dependent microstructure containing stacking faults and related mechanical properties. Thus, the essential properties must be clarified by using not only polycrystals but also single crystals. To our knowledge, single crystals and related properties have not been reported elsewhere. Thus, Co-Cr-Mo single crystals were grown and used to analyze the microstructure and the related properties. Single crystals with a composition Co-27 mass% Cr-6 mass% Mo alloy defined by ASTM F75 were grown by two single crystal apparatuses: the optical floating zone and the Bridgman methods. The single crystals with the smooth-surface shape were successfully obtained in the Bridgman method under an Ar gas atmosphere at a crystal growth rate of 5.0 or 2.5 mm/h. A portion of the crystals contain Al as Al2O3 precipitates from the crucible. Since the Al2O3 precipitate induces martensitic phase transformation from fcc (?) phase to hcp (ε) phase, the single crystals were separated into two parts (a) containing Al2O 3 precipitate and (b) in the absence of the clear precipitate. The microstructure was significantly altered by the martensitic phase transformation from the ? to ε phase induced by stress field or heating. In addition, variant formation of ε phase has a large influence on the mechanical functions of these Co-Cr-Mo alloys. Novel findings were preliminary obtained in the single crystals.

本文言語English
ホスト出版物のタイトルTHERMEC 2011
出版社Trans Tech Publications Ltd
ページ561-565
ページ数5
ISBN(印刷版)9783037853030
DOI
出版ステータスPublished - 2012
外部発表はい
イベント7th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC'2011 - Quebec City, QC, Canada
継続期間: 2011 8 12011 8 5

出版物シリーズ

名前Materials Science Forum
706-709
ISSN(印刷版)0255-5476
ISSN(電子版)1662-9752

Conference

Conference7th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC'2011
国/地域Canada
CityQuebec City, QC
Period11/8/111/8/5

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

フィンガープリント

「Single crystal growth and its microstructure in Co-Cr-Mo alloys for biomedical applications」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル