Evaluation of nanoscaled precipitates in a Cu–Ni–Si–Cr alloy during aging
| Autor: | B. Shen, Bin-Bing Tang, Yu Fangxin, Jinxuan Cheng |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Copper matrix
Morphology (linguistics) Materials science Precipitation (chemistry) Mechanical Engineering Alloy Metals and Alloys engineering.material Crystallography Mechanics of Materials Phase (matter) Scanning transmission electron microscopy Materials Chemistry engineering Orthorhombic crystal system High-resolution transmission electron microscopy |
| Zdroj: | Journal of Alloys and Compounds. 614:189-195 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2014.06.089 |
| Popis: | The concurrent existence of three kinds of nano-scaled precipitates, ordered face-centered cubic β-Ni3Si, orthorhombic δ-Ni2Si and ordered face-centered cubic (Ni, Cr, Si)-rich phase, was found in a Cu–Ni–Si–Cr alloy during aging at 500 °C by high resolution transmission electron microscopy and scanning transmission electron microscopy. It is the first time to report the precipitation of ordered fcc (Ni, Cr, Si)-rich phase in Cu–Ni–Si system alloys during aging. The morphology of β-Ni3Si precipitates changed from spheroid to ellipsoid with prolonged aging time. The δ-Ni2Si precipitates had its six variants lying on the {0 1 1}Cu habit planes and maintained disc-like during the whole aging process. The orientation relationships with copper matrix were as follows: (0 0 1)Cu//(0 0 1)δ, [1 1 0]Cu//[0 1 0]δ for δ-Ni2Si, and cube-on-cube ones for β-Ni3Si and (Ni, Cr, Si)-rich phase. The precipitation of (Ni, Cr, Si)-rich phase is responsible for high strength at overaging conditions as 500 °C. |
| Databáze: | OpenAIRE |
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