Abstract
The concentration dependence of elastic moduli has been measured over a wide concentration range of Mn-Cu alloys by means of neutron inelastic scattering and ultrasonic measurements. The elastic constant C 11 markedly decreases with the increase of Mn content and attains its minimum value near the composition Mn 82Cu 18 at which the martensitic transformation takes place at room temperature. However, a direct trigger of the phase transition is attributed to the vanishing of the shear modulus, contrary to our previous results of neutron inelastic scattering. An anomalous volume effect is discussed in connection with the small bulk modulus near the martensitic transformation in γ-MnCu alloys. The possibilities of d-electron Coulomb correlation and the formation of the local magnetic moment are discussed as origins of the martensitic transformation in Mn-rich Mn-Cu alloys.
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