Nanoindentation and nano-compression testing of Ni3Al precipitates

B. Gan, H. Murakami, R. Maaß, L. Meza, J. R. Greer, T. Ohmura, S. Tin

研究成果: Conference contribution

7 被引用数 (Scopus)

抄録

Using an AFM-based instrumented nanoindentation system, the nanoindentation response of γ′ particles (Ni3Al) in a Ni-base single crystal superalloy CMSX-4 was characterized to demonstrate the influence of the softer γ matrix on the measurement of nano-mechanical properties of γ′ particles. The properties of the γ′ particles were measured after both a standard and a coarsening heat treatment, in which the initially sub-micron sized cuboidal γ′ particles transformed to large, irregularly shaped γ′ precipitates with dimensions in excess of 30 urn. The measured nano-hardness of the coarsened γ′ precipitates in CMSX-4 appears to increase slightly with the increasing load. Nano-compression testing of cuboidal γ′ particles, electrolytically extracted from a CMSX-4 after a standard solution and age heat treatment, was also performed. With a maximum value of 10 GPa, the measured yield stress of these dislocation-free γ′ particles approaches the ideal strength and is equivalent to -G/17. Compared to the measured yield strengths of γ′ phase in its bulk crystal form, these nano-compression results are more than a factor of 33 higher. Additionally, the 'softening' effect of Ga+ ion implantation on the strength of dislocation-free nanocrystals was also assessed. The resulting yield strengths of cuboidal γ′ precipitates imaged with a focused ion beam were at least 5 GPa lower than those that had not been subjected to Ga+ ion implantation.

本文言語English
ホスト出版物のタイトルSuperalloys 2012 - Proceedings of the 12th International Symposium on Superalloys
ページ83-91
ページ数9
出版ステータスPublished - 2012 12月 1
外部発表はい
イベント12th International Symposium on Superalloys, Superalloys 2012 - Seven Springs, PA, United States
継続期間: 2012 9月 92012 9月 13

出版物シリーズ

名前Proceedings of the International Symposium on Superalloys

Other

Other12th International Symposium on Superalloys, Superalloys 2012
国/地域United States
CitySeven Springs, PA
Period12/9/912/9/13

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学

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