Authors: Zafir Alam David Eastman Minjea Jo Kevin Hemker
Publish Date: 2016/09/27
Volume: 68, Issue: 11, Pages: 2754-2760
Abstract
A hightemperature tensile tester HTTT has been established for the evaluation of micromechanical properties of materials at the mesoscale Metals and ceramics can now be tested at temperatures and strain rates between room temperature and 1200°C and 10−5 s−1 to 10−1 s−1 respectively The samples are heated in a compact clam shell furnace and strain is measured directly in the sample gage with digital image correlation The HTTT extracts representative mechanical properties as evidenced by the similarity in the evaluated microtensile properties of a solid solutionstrengthened Nibase superalloy Ni625 with that of the bulk The effectiveness of the HTTT has also been demonstrated in evaluating the tensile and stress relaxation/shortterm creep properties of a polycrystalline Nibase superalloy René 88DT The versatility in carrying out tensile shortterm creep bend tests and fracture toughness measurements makes the HTTT a robust experimental tool for smallscale and scalespecific benchmarking of multiscale ICME modelsThis work has been supported through Grant No 90058536 at Johns Hopkins University awarded by the Office of Naval Research ONR The authors thank Suman Dasgupta Binwei Zhang Stephen Ryan and Simon LockyerBratton for their technical input and undergraduate researchers Ben Long and Kevin Peters for helping with the experiments Special thanks to Drs Jeff Swab and Jim McCauley of ARL for providing us with the YTZP material and insights on the machining of ceramics We also acknowledge A Loghin D Konitzer J Williams and J Marte of GE Global Research
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