Vickers hardness tester will also produce some errors in the experimental results. The diamond-shaped press may not be as hard as the new press. As a result, the result deviates and the dimensions deviate. Therefore, after calculation, the result deviates again. My conclusion is that the machine should always be maintained to ensure that all equipment and machines are in good condition. Polishing can also be carried out to clean impurities, currently on the surface of copper. Therefore, better microstructures can be observed.
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