کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1580767 | 1514848 | 2009 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Rafting microstructure during creep of the MC2 nickel-based superalloy at very high temperature Rafting microstructure during creep of the MC2 nickel-based superalloy at very high temperature](/preview/png/1580767.png)
Directional coarsening of the single-crystalline nickel-based superalloy MC2 has been investigated by means of tensile creep tests at 1100 °C. Two specific specimen geometries were designed in order to generate a variety of stress and strain states. Different coarsening microstructures are observed: N- and P-type classical rafting but also coarsening oriented 45° away from the load axis. The comparison of microstructure maps with the local mechanical state evaluated by finite element calculations shows that the 45° directional coarsening appears in case of very high cumulated strain values (above 10%), independent of the stress sign. Transmission electron microscopy investigations show that the dislocation microstructure is similar in both N-type and 45° coarsened areas.
Journal: Materials Science and Engineering: A - Volumes 510–511, 15 June 2009, Pages 244–249