STUDY ON THE PREPARATION OF NANO-TIB2 REINFORCED AL MATRIX COMPOSITES

Description

<div>

<p>TiB₂particulate
reinforced aluminum matrix composites (TiB₂/Al-MMCs) have received
extensive attention due to a great potential in a wide variety of applications.
Nano-TiB₂/Al-MMCs have also received attention from scholars with the
development of nanotechnology in recent years. However, obstacles like
agglomeration of nanoparticles in the matrix, and the difficulty of preparation
of nanoparticulate reinforced metal matrix composites (PRMMNCs) still need to
be resolved. This
study summarizes the research progress of Al-matrix composites (Al-MMCs) in
recent years and exemplifies the common preparation methods. Experiments were designed
to study the common problems in the preparation of composite materials.</p>

<p> </p>

<p>Two experiments were designed and
completed in this study. First, TiB₂/Al-4.5Cu composites were
synthesized through a mixed salt reaction method. The distribution of reinforcing
particle in the aluminum matrix was observed. The predictive model of particle
behavior in Al-4.5wt. %Cu matrix based on thermodynamic laws was re-examined. The experiment results
are inconsistent with the prediction from a classic prediction model. Regardless
of the rate of solidification and critical velocity (V_C), the most
of the particles are rejected by advancing solid-liquid interface. Through
review of classic particle pushing theory, this study attempts to derive a new
boundary condition used to predict the behavior of reinforcing particles in a metal
matrix during solidification based on the diffusion convection equations. </p>

<p> </p>

<p>Second, nano-TiB₂/Al
composites with a variety of volume fractions were synthesized by ultrasound
assistance in a stirring method. The research has focused on optimization and
improvement of preparation methods. High-energy ball milling (HEBM) and
high-intensity ultrasound (HIU) were introduced into the fabrication process.
Furthermore, a forging post-treatment process is used to process as-cast
samples prepared by the experiment, so that the reinforcing particles in the
composite material can be redistributed. The experiment results show that HEBM facilitates
the mixing of nano-TiB₂ particles with salts. HIU helps distribute
particles evenly throughout the matrix. The Vickers hardness and tensile
strength of the composites were tested. The results indicated that the forging
treatment has great influence on the mechanical properties of composite materials.</p>

</div>

<b><br></b>

Links & Downloads

1. 10.25394/pgs.7430687.v1

Tags

nano

particle pushing

TiB2

Additional Fields

Identifer	oai:union.ndltd.org:purdue.edu/oai:figshare.com:article/7430687
Date	16 January 2019
Creators	Yanfei Liu (5929997)
Source Sets	Purdue University
Detected Language	English
Type	Text, Thesis
Rights	CC BY 4.0
Relation	https://figshare.com/articles/STUDY_ON_THE_PREPARATION_OF_NANO-TIB2_REINFORCED_AL_MATRIX_COMPOSITES/7430687