EFFECT OF THE PRECIPITATE MORPHOLOGY ON THE PHASE SEPARATION BEHAVIOUR OF γ' PRECIPITATE IN A Ni-Al-Ti ALLOY

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外文摘要：When the γ+γ' two-phase microstructure of an elastically constrained Ni-Al-Ti alloy is aged， γ' precipitates sometimes exhibit a phase separation and y particles newly appear in the γ' precipitates under the influence of chemical free energy。 The morphological changes of γ particles are influenced by the γ' precipitate morphology。 In coherent γ' particles or those surrounded by misfit dislocations， γ particles grow to the plates each of which is parallel to any of the three equivalent {001} planes。 When γ' precipitates are in a queue along [010]， all the surfaces of γ' precipitates except for (010) are accompanied by misfit dislocations， and γ particles become flat plates parallel to (010)。 Microstructure changes observed are governed by not only the elastic energies but also the chemical free energy。

外文关键词：

Ni-base alloyγ' phaseelasticity effectprecipitate morphology

作者：

Tomokazu Moritani、Yasutaka Nishikawa、Takao Kozakai、Minoru Doi

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作者单位：

Department of Materials Science and Engineering, Nagoya Institute of Technology

Nagoya 466-8555, Japan

会议名称：

Solid ->Solid Phase Transformations in Inorganic Materials 2005 vol.1

会议地点：

Phoenix,AZ(US)

会议母体文献：

International Conference on Solid -> Solid Phase Transformations in Inorganic Materials 2005 vol.1; 20050529-0603; Phoenix,AZ(US)

页码：

P.409-414

出版时间：

2005