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Which of the following is embrittlement material for liquid metal embrittlement?

Which of the following is embrittlement material for liquid metal embrittlement? Correct Answer Copper

The embrittlement metals are of low melting point, having high diffusivity in metal to be embrittlement. So Gallium has a melting point around room temperature, while sodium and tin also have very low melting point. But the copper has a high melting point, so it does not satisfy the condition.

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