ON THE DUCTILITY OF NI3AL - EFFECTS OF STRAIN-RATE, ENVIRONMENT AND BORON

Authors
SCHULSON EM XU Y
Citation
Em. Schulson et Y. Xu, ON THE DUCTILITY OF NI3AL - EFFECTS OF STRAIN-RATE, ENVIRONMENT AND BORON, Acta materialia, 45(8), 1997, pp. 3491-3494
Citations number
33
Categorie Soggetti
Material Science","Metallurgy & Metallurigical Engineering
Journal title
Acta materialia → ACNP
ISSN journal
13596454
Volume
45
Issue
8
Year of publication
1997
Pages
3491 - 3494
Database
ISI
SICI code
1359-6454(1997)45:8<3491:OTDON->2.0.ZU;2-M
Abstract
Tensile experiments have established that polycrystals of stoichiometr ic Ni3Al are brittle in air over the range of strain rate from 10(-4) to 7 s(-1). Ni-rich polycrystals and boron-doped stoichiometric alloys undergo a brittle-to-ductile transition upon increasing strain rate. The transition correlates with the enrichment of nickel on the grain b oundaries. The strain rate and (presumably) environmental effect appea r to be caused by the embrittlement not of the Ni3Al per se, but of th e intergranulular Ni-enriched region. (C) 1997 Acta Metallurgica Inc.