Synopsis
The grain boundaries of a polycrystalline material play an important role in low cycle fatigue at high temperatures. This paper describes some recent experiments designed specifically to investigate the mechanical characteristics of grain boundaries at testing frequencies of <1 Hz. The tests were conducted on high purity Pb, high purity Al and an Al-3% Mg solid solution alloy. For each material, it is shown that the grain boundaries migrate and slide in a regular and cyclic manner such that there is an approximate one-to-one correspondence between the boundary markings and the number of testing cycles. The occurrence of migration and sliding was investigated in detail to provide a comprehensive framework for the understanding of grain boundary processes in high temperature fatigue. It is demonstrated that measurements of the amounts of grain boundary migration after very small numbers of cycles (<15) may be used to make reasonable estimates of the amounts of migration occurring after up to ~104 cycles.
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References
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© 1987 Elsevier Applied Science Publishers Ltd
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Langdon, T.G. (1987). The Role of Grain Boundaries in Low Cycle Fatigue at High Temperatures. In: Rie, KT. (eds) Low Cycle Fatigue and Elasto-Plastic Behaviour of Materials. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3459-7_10
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DOI: https://doi.org/10.1007/978-94-009-3459-7_10
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-8049-1
Online ISBN: 978-94-009-3459-7
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