کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5458223 | 1516165 | 2017 | 6 صفحه PDF | دانلود رایگان |
- An ultrahigh fracture toughness (KIC) was achieved in a fine-grained Zr.
- The high KIC can be attributed to the high strain hardening.
- The high strain hardening originated from defect structures with grains.
- The toughening mechanism of the fine-grained Zr was investigated.
The poor fracture toughness of fine- and ultrafine-grained materials limits their structural applications. Here, nanoscale defect structures were introduced into fine grains (d = 2-5 μm) of pure Zr by using cryorolling and subsequent annealing at 500 °C for 1 h. An ultrahigh fracture toughness, KIC = 146 MPa m1/2, was achieved in the sample, which was much higher than those, KIC = 79 MPa m1/2 and 58 MPa m1/2, of coarse-grained and nanostructured Zr and reported values, KIC â¤Â 103 MPa m1/2, of Zr and Zr alloys. The high fracture toughness was attributed to the suppressed propagation of cracks in the material due to the high strain hardening originated from the nanoscale defect structures within grains. The present work provides an alternative toughening strategy for fine- or ultrafine-grained materials.
Journal: Journal of Alloys and Compounds - Volume 729, 30 December 2017, Pages 89-94