Download or read book Deformation Mechanisms of Nial Cyclicly Deformed Near the Brittle-To-Ductile Transition Temperature written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-17 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: The intermetallic compound NiAl is one of many advanced materials which is being scrutinized for possible use in high temperature, structural applications. Stoichiometric NiAl has a high melting temperature, excellent oxidation resistance, and good thermal conductivity. Past research has concentrated on improving monotonic properties. The encouraging results obtained on binary and micro-alloyed NiAl over the past ten years have led to the broadening of NiAl experimental programs. The purpose of this research project was to determine the low cycle fatigue properties and dislocation mechanisms of stoichiometric NiAl at temperatures near the monotonic brittle-to-ductile transition. The fatigue properties were found to change only slightly in the temperature range of 600 to 700 K; a temperature range over which monotonic ductility and fracture strength increase markedly. The shape of the cyclic hardening curves coincided with the changes observed in the dislocation structures. The evolution of dislocation structures did not appear to change with temperature. Cullers, Cheryl L. and Antolovich, Stephen D. Unspecified Center BRITTLENESS; DUCTILE-BRITTLE TRANSITION; DUCTILITY; FAILURE MODES; FRACTURE STRENGTH; HIGH TEMPERATURE; INTERMETALLICS; METAL FATIGUE; OXIDATION RESISTANCE; STRUCTURAL DESIGN; TEMPERATURE EFFECTS; THERMAL CONDUCTIVITY; TRANSITION TEMPERATURE; DEFORMATION; MELTING; STOICHIOMETRY...