Question

high temperature creep is a diffusion controlled process​

Answer 1

Explanation:

Creep is a diffusion-controlled process and therefore it becomes of major importance at elevated temperatures, typically at temperatures at and above $0:5 Tm where Tm is the absolute melting temperature of the material.

Answer 2

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The difficulties in identifying the creep mechanism become especially significant at low stresses. ... Creep is a diffusion-controlled process and therefore it becomes of major importance at elevated temperatures, typically at temperatures at and above $0:5 Tm where Tm is the absolute melting temperature of the material.