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Thermal stability of electrodeposited nanocrystalline Co-1.1at%P

Pyuck-Pa Choi ; Melina da Silva (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; Uta Klement (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; Talaat Al-Kassab ; Rainer Kirchheim
Acta Materialia Vol. 53 (2005), 16, p. 4473-4481.
[Artikel, refereegranskad vetenskaplig]

Nanocrystalline Co-1.1at.%P prepared by pulsed electrodeposition was investigated with respect to thermal stability. Several characterization methods such as differential scanning calorimetry, X-ray diffraction, transmission electron microscopy, field ion microscopy and tomographic atom probe were applied. Between 673 and 733 K, the allotropic phase transformation (hcp-Co to fcc-Co) sets in and abnormal grain growth is observed. It is suggested that there is a synergistic effect between abnormal grain growth and the allotropic phase transformation. Between 733 and 753 K, the P excess of the grain boundaries decreases, Co2P and CoP precipitates form, and normal grain growth occurs. Thus, the P-segregation to the grain boundaries is held responsible for the increased thermal stability of Co-1.1at.%P at temperatures below 753 K. The thermal stability of this alloy can be mainly attributed to the reduction of grain-boundary energy.

Nyckelord: Nanocrystalline materials; Co–P alloy; Segregation; Thermal stability; Grain growth



Denna post skapades 2006-09-25. Senast ändrad 2014-09-02.
CPL Pubid: 6970

 

Institutioner (Chalmers)

Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik (2005-2017)

Ämnesområden

Materialteknik

Chalmers infrastruktur

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