Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
TRANSMISSION ELECTRON-MICROSCOPY CHARACTERIZATION OF MECHANICALLY ALLOYED NIAL POWDER AND HOT-PRESSED PRODUCT
Autore:
PYO SG; KIM NJ; NASH P;
Indirizzi:
POHANG UNIV SCI & TECHNOL,CTR ADV AEROSP MAT,POB 125 POHANG 790600 SOUTH KOREA IIT,DEPT MET & MAT ENGN CHICAGO IL 60616
Titolo Testata:
Materials science & engineering. A, Structural materials: properties, microstructure and processing
, volume: 182, anno: 1994,
pagine: 1169 - 1173
SICI:
0921-5093(1994)182:<1169:TECOMA>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
8
Recensione:
Indirizzi per estratti:
Citazione:
S.G. Pyo et al., "TRANSMISSION ELECTRON-MICROSCOPY CHARACTERIZATION OF MECHANICALLY ALLOYED NIAL POWDER AND HOT-PRESSED PRODUCT", Materials science & engineering. A, Structural materials: properties, microstructure and processing, 182, 1994, pp. 1169-1173

Abstract

NiAl intermetallic powder has been synthesized by mechanical alloyingof elemental powders in an attritor mill using controlled atmospheres. The powders contain a bimodal distribution of dispersoids with sizesranging from 5 to 200 nm. Analytical transmission electron microscopyhas been used to establish the types of dispersoid phase present in the powder and the development of the microstructure with processing. In the finished powder the majority of the dispersoids present are either alpha-alumina or aluminum nitride depending on the process conditions. The grain size in the as-milled powder is nanocrystalline. Two types of hot pressing have been used for consolidation: a simple pressingusing an argon cover gas and a vacuum hot pressing. After hot pressing to greater than 97% density, both grain and dispersoid growth are observed to have occurred and the larger dispersoids appear to coarsen in a coupled manner with the grains via a dragging mechanism. Hot-pressed materials show much improved yield strength and ductility compared with the ingot-cast NiAl, indicating the effectiveness of mechanical alloying in improving the mechanical properties.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 10:26:09