An iterative approach to determine composition and heat treatmentfrom the mechanical yield strength of an aluminum-lithium alloy
Fragomeni, J.W.
Dept. of Mech. Eng., Ohio Univ., Athens, OH;
Abstract
The development of a model to predict an alloy's microstructure
and processing variables from specific mechanical properties or desired
mechanical properties was the general emphasis of this investigation.
The processing variables included the alloy's overall heat treatment,
which involves the aging practice (time and temperature) and the
solution heat treatment practice, and also the manufacturing processing
of the alloy which involved direct extrusion processing. The particular
mechanical property of interest for the aluminum-lithium demonstration
alloy was the mechanical tensile strength. The microstructure was used
as the basis for determining both the composition and the heat treatment
processing requirements for obtaining the desired mechanical property.
Specifically, a materials design model was designed to determine
microstructural parameters from mechanical properties as the basis for
prediction and/or specification of the heat treatment processing
parameters. An iterative approach was taken to improve the initial
determination of thermal processing and composition. The overall
approach will design a precipitation hardened alloy heat treatment and
composition to satisfy the design tensile strength and microstructure
requirements of a given materials design and manufacturing program
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