Phase Equilibria and Microstructure on γ′ Phase in Co-Ni-Al-W System

Autor:	Katsunari Oikawa, Toshihiro Omori, Kazuya Shinagawa, Ikuo Ohnuma, Jun Sato, Ryosuke Kainuma, Kiyohito Ishida
Rok vydání:	2008
Předmět:	Materials science Mechanical Engineering Morphologic change Solidus Electron microprobe Condensed Matter Physics Microstructure Crystallography Lattice constant Differential scanning calorimetry Mechanics of Materials Phase (matter) General Materials Science Solvus
Zdroj:	MATERIALS TRANSACTIONS. 49:1474-1479
ISSN:	1347-5320 1345-9678
DOI:	10.2320/matertrans.mer2008073
Popis:	Phase equilibria between the y and y' phases at 900°C in the Co-(10-70)Ni-Al-W system were determined by electron probe microanalysis (EPMA) and X-ray diffractometry (XRD). It was found that the "/ phase with L1 2 structure continuously exists from the Co side to the Ni side in Co-Ni-Al-W system and that it widens to the low W region with increasing Ni content. The partition of Al into the y' phase increased with Ni content, while the W changed from a y' former to a y former by increase of Ni content. Differential scanning calorimetry (DSC) measurements also revealed that the y' solvus temperature increases with Ni content, while the solidus temperature is hardly affected by such content. The lattice parameter of the y and y' phases and the mismatch decreased with increasing Ni content, which caused the morphologic change of the γ' precipitates from cubes to spheres.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0a83ebcf88120f6542497513b8832f7e https://doi.org/10.2320/matertrans.mer2008073 Zobrazit plný text záznamu