کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1449930 | 988718 | 2007 | 12 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The mechanical properties and the deformation microstructures of the C15 Laves phase Cr2Nb at high temperatures The mechanical properties and the deformation microstructures of the C15 Laves phase Cr2Nb at high temperatures](/preview/png/1449930.png)
Compression tests between 1250 and 1550 °C and 10−5 and 5 × 10−3 s−1 and transmission electron microscopy have been employed to investigate the high temperature mechanical properties and the deformation mechanisms of the C15 Cr2Nb Laves phase. The stress-peaks in the compression curves during yielding were explained using a mechanism similar to strain aging combined with a low initial density of mobile dislocations. The primary deformation mechanism is slip by extended dislocations with Burgers vector 1/2〈1 1 0〉, whereas twinning is more frequent at 10−4 s−1. Schmid factor analysis indicated that twinning is more probable in grains oriented so as to have two co-planar twinning systems with high and comparable resolved shear stresses. Twinning produced very anisotropic microstructures. This may be due to synchroshear: a self-pinning mechanism which requires co-operative motion of zonal dislocations.
Journal: Acta Materialia - Volume 55, Issue 6, April 2007, Pages 1873–1884