Hakaru Masumoto1, Michio Kikuchi1 and Showhachi Sawaya1
1The Research Institute of Electric and Magnetic Alloys, 107, Higashi 8-bancho, Sendai
Young's modulus at low and high temperatures, thermal expansion and hardness at room temperature have been measured with Mn-Cu-V alloys subjected to various heat treatments and cold working. The ternary alloys annealed at 900°C showed distinct anomalous changes related to antiferromagnetic \rightleftarrows paramagnetic transformations in Young's modulus vs temperature curves. The temperature coefficient of Young's modulus is altered appreciably by annealing, water quenching, cold working, and reheating after cold working or water quenching. It also shows a large composition dependence. The presence of a large positive maximum in the temperature coefficient of Young's modulus vs composition curve demonstrates the Elinvar property of the alloys.
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