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GRAIN-BOUNDARY SEGREGATION IN Al10%Mg ALLOYS AT HOT WORKING TEMPERATURES
 

Summary: GRAIN-BOUNDARY SEGREGATION IN Al±10%Mg
ALLOYS AT HOT WORKING TEMPERATURES
X.-Y. LIU1
and J. B. ADAMS2
1
Department of Materials Science and Engineering, University of Illinois, Urbana, IL 61801, U.S.A.
and 2
Department of Chemical, Bio. and Materials, Arizona State University, Tempe, AZ 85287-6006,
U.S.A.
(Received 7 July 1997; accepted 12 January 1998)
AbstractŠMonte-Carlo simulations are done to determine Mg enrichment at various grain-boundaries of
Al±10%Mg alloys at hot working temperatures. The interatomic potentials used in the simulations are
developed using the force-matching method. The Mg segregation levels at the grain-boundaries are found
to vary from 20% to 40%. The segregation enrichment dierences at dierent grain-boundary sites are
explained in terms of atomic size and local hydrostatic stress. The segregation level varies strongly with
[110] tilt boundaries from low to high angle while showing minimal variation with [100] twist boundaries.
Segregation levels are found to have some correlation with grain-boundary energy. The eect on grain-
boundary decohesion due to Mg segregation is found to be a modest (10±35%) reduction in fracture
energy compared to the fracture energy in pure Al. # 1998 Acta Metallurgica Inc.
1. INTRODUCTION

  

Source: Adams, James B - Department of Chemical and Materials Engineering, Arizona State University

 

Collections: Materials Science