This study aims to investigate the effect of compositional gradient on nano-, micro- and macro-mechanical
properties in aluminum (A1050)/ duralumin (A2017) multi-layered clad structures fabricated by hot rolling. Such multilayered
clad structures are possibly adopted to a new type of automobile crash boxes to effectively absorb the impact
forces generated when automobiles having collisions. 2- and 6-layered clad structures with asymmetric lay-ups from one
side of aluminum to another side of duralumin have been fabricated, which have been suffering three different heattreatments
such as (1) as-rolled (no heat-treatment), (2) annealed at 400°C and (3) homogenized at 500°C followed by
water quenching and aging (T4 heat treatment). For nano- and micro-scale mechanical properties proved by
nanoindentation, higher hardness and elastic modulus correspond to higher Cu content at the interface in annealed and
aged samples. For macro-scale mechanical properties, internal friction of 2-layered clad structures is higher than that of
6-layered clad structures in any heat-treatment samples. Deep drawing formability of annealed samples is considerably
high compared to as-rolled and aged ones.
The aim of this study is to investigate thermo-mechanical response of ZrO2/Ti functionally graded materials
(FGMs) fabricated by spark plasma sintering (SPS) based on a mean-field micromechanics model, which takes account
of micro-scale stress relaxation due to interfacial diffusion between ceramic and metal phases as well as creep of both
phases. A resistance to cyclic thermal shock loadings of FGMs with different compositional gradation patterns including
Ti-rich, linear and ZrO2-rich gradation patterns has been investigated. The results demonstrate that Ti-rich FGMs show
superior properties among the tested FGM samples. Mean-field micromechanics-based examinations reveal that the
range and ratio of thermal stresses in ZrO2 surface layers in FGMs can affect cyclic thermal shock fracture behaviour but
not mean thermal stresses.
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