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The yield stress of a metal sample with very large grain size was 20 MNm-2, whereas...

The yield stress of a metal sample with very large grain size was 20 MNm-2, whereas the yield stress of an otherwise identical sample with grain size 4 µm was 120 MNm-2. Explainwhy te yield stress increased in this way. Estimate the yield strength of the same metal sample with grain size of 10 µm.

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