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An equal-molar CoCrFeMnNi, face-centered-cubic high-entropy alloy system and a

face-centered-cubic stainless steel described as a medium-entropy system, are

measured by in situ neutron-diffraction experiments subjected to continuous tension

at room and several elevated temperatures, respectively. With spallation neutron,

the evolution of multiple diffraction peaks is collected simultaneously for

lattice-elasticity study. Temperature variation of elastic stiffness of a single

face-centered-cubic-phase Ni and a single face-centered-cubic-phase Fe are

compared as low-entropy metals. The CoCrFeMnNi high-entropy alloy shows

distinct lattice anisotropy.
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