Internal friction associated with phase transformation of nanograined bulk Fe–25 at.% Ni alloy |
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Authors: | Hongbin Wang Jihua Zhang T Y Hsu |
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Affiliation: | School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China |
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Abstract: | The internal friction and modulus of a nanograined bulk Fe–25 at.% Ni prepared by an inert gas condensation and in situ warm consolidation technique were measured in temperature range ?100 to 400 °C by means of a dynamic mechanical analyzer (DMA). An internal friction peak at around ?75 °C associated with martensitic transformation was observed. During heating, an internal friction peak at about 200 °C accompanied with the decrease of modulus was also observed, which was proved by XRD that this may mainly be attributed to the reverse phase transformation of stress-induced martensite (SIM). Some abnormal features of modulus versus temperature were observed and discussed. |
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Keywords: | Internal friction Nonagrained alloy Fe–Ni Martensitic transformation |
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