2014-Sustainable Industrial Processing Summit
SIPS 2014 Volume 5: Composite, Ceramic, Quasi-crystals, Nanomaterials & Coatings
| Editors: | Kongoli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2014 |
| Pages: | 578 pages |
| ISBN: | 978-1-987820-07-2 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
CD shopping page
Experimental study of microstrain in the nanostructured w-Al70Cu20Fe10 phase
Mirtha Pillaca1; Carlos Landauro2; Milida Pinto2;1UNMSM, Lima, Peru; 2SAN MARCOS UNIVERSITY, Lima, Peru;
Type of Paper: Regular
Id Paper: 395
Topic: 6
Abstract:
In the Al-Cu-Fe phase diagram, quasicrystals occupy a narrow region normally surrounded by crystalline and amorphous phases. In particular, a small variation of the ideal quasicrystalline composition means a new crystalline structure like the w-Al70Cu20Fe10 phase (w-phase). Consequently, the w-phase is a simple crystalline phase which can help us to understand the effect of microstrain in Al-Cu-Fe phases due to the nanostructuration of the samples. In this context, in the present work we study the influence of the mechanical milling on the microstrain of nanostructured w-Al70Cu20Fe10 phase. The bulk samples were prepared by arc furnace and then nanostructured by means of mechanical milling in a high energy ball milling equipment SPEX 8000 for different time periods (0-5 hours).
The results indicate that the synthesized sample (with tetragonal unit cell and space group P4/mnc) have a high structural quality. The study of the line-broadening intensity and the diffraction line of the un-milled (bulk) and milled (nanostructured) samples using Rietveld method indicates a slight increase of the microstrain from 0.00(5)% up to 0.19(2)%, respectively. Furthermore, the average grain size decreases up to an average value of 12.79(3) nm for the 5 hours milled sample. Additionally, the only increase of the c lattice parameter from c=14.80(8) A… up to c=14.83(1) A… suggests a unidirectional lattice expansion due to the mechanical milling process.