Effect of thermal treatment and ball milling on microstructure and phase transformation of Ni−Mn−Ga−Nb alloys
| Autor: | Feng Chen, Bing Tian, Li Li, Wang Junsong, Yunxiang Tong |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Annealing (metallurgy) Alloy Metals and Alloys Analytical chemistry Curie transition 02 engineering and technology Thermal treatment engineering.material 021001 nanoscience & nanotechnology Geotechnical Engineering and Engineering Geology Condensed Matter Physics Microstructure 01 natural sciences Diffusionless transformation 0103 physical sciences Materials Chemistry engineering 0210 nano-technology Ball mill |
| Zdroj: | Transactions of Nonferrous Metals Society of China. 29:2117-2127 |
| ISSN: | 1003-6326 |
| DOI: | 10.1016/s1003-6326(19)65118-6 |
| Popis: | To clarify phase transformation evolution of Nb-doped Ni−Mn−Ga bulk alloys after aging and ball milling, the microstructure and phase transformation of the aged and ball-milled dual-phase Nb-doped Ni−Mn−Ga alloys were investigated by SEM, EDS, XRD, DSC and susceptibility measurements. The as-cast alloys were mainly composed of the second phase with layer-shape and presented a reduced martensitic transformation with increasing the second phase content. The second phase transformed from layer-shape to dense bar-shape and the martensitic transformation was enhanced after being quenched at 1173 K. After aging at 673 and 873 K, the 3% Nb alloy with less second phase exhibited a single-step phase transformation, whereas the 6% Nb and 9% Nb alloys with more second phase exhibited a two-step martensitic transformation and Curie transition. The martensitic transformation and Curie transition of the as-milled dual-phase particles disappeared and were retrieved after annealing at 1073 K due to the recovery of high ordered structure of the matrix. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect