Microstructure and hardness of W-25Re alloy processed by high-pressure torsion
| Autor: | Zi-yang He, Cheng Liang, Wei-xi Ji, Chen-hao Qian |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Alloy Metals and Alloys 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Geotechnical Engineering and Engineering Geology Condensed Matter Physics Microstructure 01 natural sciences Indentation hardness Grain size Brittleness 0103 physical sciences Materials Chemistry engineering Hardening (metallurgy) Grain boundary Composite material 0210 nano-technology Mass fraction |
| Zdroj: | Transactions of Nonferrous Metals Society of China. 27:2622-2629 |
| ISSN: | 1003-6326 |
| DOI: | 10.1016/s1003-6326(17)60290-5 |
| Popis: | The evolution of microstructure and microhardness was studied in a commercial tungsten-25% rhenium (mass fraction) (W-25Re) alloy processed by the high pressure torsion (HPT) procedure under a pressure of 7.7 GPa up to 10 revolutions at different temperatures. The results show that the samples processed by 10 revolutions at room temperature could have the smallest grain size at around 0.209 μm. High saturation hardness (HV ∼1200) could be achieved after the rapid strengthening stage for samples processed by 10 revolutions both at room temperature and at 573 K. Microstructural observation and analysis from Hall–Patch relationship could reveal that grain refinement and grain boundaries strengthening are the main factors of hardening mechanism in W-25Re alloy. It is also demonstrated that sintered W-25Re sample may have brittle phase separation phenomenon after HPT processing. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect