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MgO and Al2O3 can be used at high temperature creep resistance due to _________

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MgO and Al2O3 can be used at high temperature creep resistance due to _________

(a) High melting point

(b) High oxygen concentration

(c) Low density

(d) Chemical stability

This question was posed to me in an interview for job.

The origin of the question is Mechanisms of Creep & Creep Resistant Materials topic in division Plastic Deformation and Creep in Crystalline Materials, Elastic, Anelastic and Viscoelastic Behaviour of Engineering Material & Metallurgy

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Best answer
The correct answer is (a) High melting point

Best explanation: Creep starts to occur at a temperature higher than 0.4 Tm. Therefore, high melting point materials like MgO and Al2O3 are used for high-temperature operations.

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