Chemical Engineering January 2022 - 7

Predicting aluminum-alloy mechanical properties
at high temperatures
A
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luminum is used for a number of
applications because it is lighter
than iron and easy to machine.
However, Al is usually alloyed with
Cu, Mg or other elements for improved
strength. Developing such alloys that
maintain their strength at high temperatures
(over 100°C) takes a lot of time, because
it requires developers' knowledgerich
experience and performing many
analysis and evaluations.
Aiming to solve these problems, Showa
Denko K.K. (SDK; Tokyo, Japan; www.
sdk.co.jp) has been participating in a project
under Japan's Council for Science,
Technology and Innovation (CSTI), Crossministerial
Strategic Innovation Promotion
Program. In this project, SDK, the National
Institute for Material Science (NIMS; Tsukuba,
Japan) and the University of Tokyo
have collaboratively developed a computer
system using neural networks - an
artificial-intelligence algorithm - to accelerate
the development of materials with
optimal mechanical properties.
The researchers focused on 2000-series
oped that suggests a set of Al-alloy design
conditions that maximizes the probability of
satisfying the desired strength at an arbitrary
temperature. The models are said to shorten
development time for Al alloys to about onehalf
to one-third of that required with conventional
development methods.
Detail of the study were presented last
month at a virtual session of the 2021 Materials
Research Society's Fall meeting (December
6-8, 2021; www.mrs.org).
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Al alloys (those that contain Cu and Mg),
and utilized design data of 410 records of Al
alloys listed in public databases, including
the Japan Aluminum Assn., and developed
neural network models (NNMs) that accurately
predict the strength of Al alloys at various
temperatures (from room temperature
to over 200°C). In addition, the architecture
and parameters of the neural network was
optimized with Bayesian inference by applying
the replica-exchange Monte Carlo
method. This NNM can estimate - within
2 seconds - the alloy's strength under
10,000 different conditions.
An " inverse design tool " was also develzonal
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(Continues on p. 8)
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JANUARY 2022
7

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Chemical Engineering January 2022

Table of Contents for the Digital Edition of Chemical Engineering January 2022