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What is the angle of indenter in Vicker’s hardness test?

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What is the angle of indenter in Vicker’s hardness test?

(a) 96 degrees

(b) 110 degrees

(c) 136 degrees

(d) 150 degrees

I have been asked this question in quiz.

My query is from Hardness Tests on Metals topic in chapter Wear of Metals, Mechanical Properties and Testing of Engineering Material & Metallurgy

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Correct answer is (c) 136 degrees

Easiest explanation: In Vicker’s hardness test, a square pyramid-shaped indenter is used for indentation. This indenter is placed at an angle of 136 degrees between opposite faces. This angle was chosen as it approximates the most desirable ratio of indentation diameter to ball diameter in Brinell hardness test.

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