Abstract
The aim of the submitted work is to study the influence of applied loads ranging from 0.09807 N to 0.9807 N on measured values of micro-hardness of heat treated aluminum alloy 6082. The influence of applied load on a measured value of micro-hardness was evaluated by Meyer’s index n, PSR method and by Analysis of Variance (ANOVA). The influence of the load on the measured value of micro-hardness is statistically significant and the relationship between the applied load and micro-hardness manifests the moderate reverse ISE. As the temperature of the solution treatment rises, the YS/UTS ratio and also Meyer’s index n, measured and “true hardness“ increase. On the other hand, its effect on the plastic properties of the alloy is ambiguous.
Highlights
Aluminum alloys have been more and more extensively utilized in structural applications, aircraft, building and automotive industry due to their light weight and attractive mechanical properties achieved by heat treatment
The principle of the Vickers micro-hardness method is identical to the macro-hardness test, except for considerably smaller test loads
In contrast to the above “normal” indentation size effect (ISE), a reverse type of ISE (RISE), where the apparent micro-hardness increases with increasing load, is known
Summary
Aluminum alloys have been more and more extensively utilized in structural applications, aircraft, building and automotive industry due to their light weight and attractive mechanical properties achieved by heat treatment. In contrast to the (macro)hardness, it is well known that the apparent micro-hardness of solids depends on the load This phenomenon, the indentation size effect (ISE), usually involves a modification in the apparent micro-hardness with a tenvariation of the load [2, 3]. If a very low load is used, the measured micro-hardness is usually high; with an increase in test load, the measured micro-hardness decreases Such a phenomenon is sometimes referred to as “normal” ISE. In contrast to the above “normal” ISE, a reverse (inverse) type of ISE (RISE), where the apparent micro-hardness increases with increasing load, is known. It essentially takes place in materials with predominant plastic deformation. It can be explained as an effect of vibration, indenter
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