Phase Identification in Multi-Phase Cu-Zn/Cu-Al Alloys with Macroscopic Concentration Gradients
| Autor: | T. Kaaden, Markus Rettenmayr, Stephanie Lippmann |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Multi phase Metals and Alloys Analytical chemistry 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Mechanics of Materials Phase (matter) 0103 physical sciences 0210 nano-technology Concentration gradient |
| Zdroj: | Practical Metallography. 58:83-95 |
| ISSN: | 2195-8599 0032-678X |
| DOI: | 10.1515/pm-2020-0005 |
| Popis: | In order to study concentration invariant phase transitions in Cu-Zn-Al alloys which occur in a very narrow concentration range samples with concentration gradients were produced. Cylinders made of brass and Cu-Al bronze were joined by diffusion bonding and subsequently annealed. The samples exhibit multi-phase regions (α, β, γ1, martensite) with changing compositions and very different chemical properties. Standard techniques for the metallographic preparation of Cu alloys usually target specific phases within limited concentration ranges. To evaluate the microstructure, a two-stage chemical etching method using sodium hydroxide solution and subsequent selective colour etching was successfully used to gain an overview of the phases present in different areas along the concentration gradient. For the characterization of martensite, its birefringent optical properties were utilized. In polarized light, details of the martensitic structure are revealed which would otherwise only be accessible by scanning electron methods. |
| Databáze: | OpenAIRE |
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