Abstract
Young’s modulus at high temperatures, and thermal expansion and hardness at room temperature have been measured for Mn–Ni–V, Mn–Ni–Nb and Mn–Ni–Ta alloys subjected to various heat treatments and cold working. Young’s modulus vs temperature curves of the annealed ternary alloys indicate anomalous changes that are associated with the antiferromagnetic\
ightleftarrowsparamagnetic transformations. The temperature coefficient of Young’s modulus at room temperature are strongly affected by annealing, cold working and reheating after cold working and also depends upon composition. The temperature coefficient vs composition curves are found to exhibit large positive maxima. These results show that the ternary alloys have the Elinvar characteristics. Young’s modulus at room temperature in the ternary alloys increase with additions of the additional elements V, Nb and Ta.
