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| Content Provider | Springer Nature Link |
|---|---|
| Author | Li, Qiangyong Richards, N. L. |
| Copyright Year | 2012 |
| Abstract | The strain recovery route to generate a significant increase in special boundaries nominally involves a strain level of less than about 10%, plus a recovery anneal at a temperature–time combination sufficient to cause grain boundary migration, but insufficient cold work/time/temperature combinations to cause recrystallization of the material being processed. In the present communication using a simple material to avoid complications from industrial alloys, commercially pure (C.P.) Ni was processed using a single low strain value of 6% and a temperature of 800–1000 °C for time up to 38 min. The fraction of special grain boundaries, F $_{sp}$, based on a Σ3–29 as evaluated by Orientation Image Microscopy was then compared with the as-received C.P. Ni and Ni strained 25% and annealed at 800 °C to give a recrystallized structure. For the single low strain route, a 6% deformation at a temperature of 800 °C and a time of 8–10 min resulted in an F $_{sp}$ value of close to 80%, as well as a grain size of about 25–35 μm compared to the as-received value of about 25 μm. Thus, while grain boundary migration occurred under these processing conditions, the increase in grain size was not excessive and would not result in a large reduction in tensile properties. The single 25% rolled and 800 °C recrystallized test samples however resulted in no major increase in F $_{sp}$ relative to the as-received material, both being in the range 35–40% over a range of times. Therefore, compared to the optimized F $_{sp}$ low strain recovery values of close to 80%, the fully recrystallized F $_{sp}$ values were approximately half. It should be noted however that multiple cycles of higher strain values rather than a single strain value, coupled with a recrystallized anneal, have been shown in the literature to result in increase in the F $_{sp}$ levels. |
| Starting Page | 21 |
| Ending Page | 29 |
| Page Count | 9 |
| File Format | |
| ISSN | 21929262 |
| Journal | Metallography, Microstructure, and Analysis |
| Volume Number | 2 |
| Issue Number | 1 |
| e-ISSN | 21929270 |
| Language | English |
| Publisher | Springer-Verlag |
| Publisher Date | 2012-12-12 |
| Publisher Place | New York |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Grain boundary engineering Thermo-mechanical processing Orientation image microscopy Nickel Metallic Materials Characterization and Evaluation of Materials Structural Materials Surfaces and Interfaces, Thin Films Nanotechnology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Metals and Alloys |
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