Probing The Constitutive Behaviour Of An
Al-Sn-Si Alloy By Tensile Testing And
Instrumented Indentation
Author(s)
R. Schouwenaars, H. A. Durán, A. Bravo, V. H. Jacobo & A. Ortiz
Abstract
Al-Sn-Si alloys used in tribological applications present a composite
microstructure consisting of the Al-matrix, Sn-grains and dispersed Si and
intermetallic particles. Upon plastic deformation, compatibility strains at the
matrix-particle interface produce an initial stage of pronounced work hardening,
while cold-rolled samples show partial recovery at room temperature which
reduces the yield strength. Both phenomena lead to anomalous hardening. Ascast
thin slabs of Al-13%Sn-2.5%Si-1%Cu were cold rolled and annealed at
300°C for 60 min. Tensile tests were performed along the rolling direction and
micro-indentation tests executed along the normal, transverse and rolling
direction. Tensile curves were fitted by several conventional hardening relations,
of which the Voce-relationship provided the best flexibility in dealing with the
non-standard hardening behaviour. Use of the fitted data in a finite-element
model for microindentation provided a reasonable approximation to the
measured load-displacement curves but material anisotropy is an overriding
factor which was not accounted for. Evidence of creep was clearly present both
in the loading stage as in the constant load part of the indentation curves.
Keywords: indentation, reverse modelling, finite elements, creep, anisotropy.
1 Introduction
Al-Sn alloys are used as the tribological component of journal bearings for light
combustion engines. Although historically a fairly broad amount of compositions
has been normalised [1], nowadays two alloys dominate the market, being SAE
783 (Al-19%Sn-1%Cu by weight) and SAE 788 (Al-12%Sn-2.5%Si-1%Cu), the
Keywords
indentation, reverse modelling, finite elements, creep, anisotropy.
Related Book
Other papers in this volume
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