In Situ Micromechanical Testing for Single Crystal Property Characterization
- 185 Downloads
An in situ method to fully characterize the single crystal properties for polycrystalline alloys is developed using microscale experimental and analysis techniques. The developed method can be applied to metallic engineering alloys that do not exist in single crystal form. Thus using this technique, testing and analysis on polycrystalline samples can yield the single crystal elastic and plastic properties required as input to micro- and mesoscale computational models such as those which rely on crystal plasticity theory. Compression and shear experiments are conducted on single crystal specimens of various crystallographic orientations. Analytical and numerical analysis of the experimental results yields a set of equations that can be solved for the single crystal elastic parameters. This novel methodology is demonstrated to produce reasonable elastic property prediction results for an aerospace aluminum lithium alloy, AA2070. Details regarding the experiments and analysis are provided to facilitate application of the technique to a wide range of polycrystalline material systems and properties.
The authors are grateful for support and funding from Lightweight Innovations for Tomorrow (LIFT), operated by the American Lightweight Materials Manufacturing Innovation Institute (ALMMII). The authors also thank UTRC colleagues David Gagnon, Douglas Logan, Caitlyn Thorpe, Roy Wong, and Fred Espinosa for their assistance with specimen fabrication and testing.
- 3.T. Dubois, Pratt, Alcoa Pioneer Use of Aluminum Fan Blades (Aviation International News, 2014). https://www.ainonline.com/aviation-news/air-transport/2014-07-28/pratt-alcoa-pioneer-use-aluminum-fan-blades#.
- 4.L.B. Borkowski, J.A. Sharon and A. Staroselsky, Int. J. Comput. Methods Exp. Meas. 2018, vol. 6, pp. 635-646.Google Scholar
- 5.L.B. Borkowski and A. Staroselsky (2018) Multiscale Model for Al–Li Material Processing Simulation Under Forging Conditions. Springer, New York pp. 355.Google Scholar
- 23.L.L. Li, Z.J. Zhang, J. Tan, C.B. Jiang, R.T. Qu, P. Zhang, J.B. Yang and Z.F. Zhang, Scientific Reports 2015, vol. 5, pp. 15631.1-15639.8.Google Scholar
- 40.J.E. Hatch, A. Association and A.S. Metals: Aluminum: Properties and Physical Metallurgy. (American Society for Metals, Russell 1984).Google Scholar
- 43.ASTM-D4255, (ASTM International, West Conshohocken, PA: 2015).Google Scholar
- 44.G. Simmons: Single Crystal Elastic Constants and Calculated Aggregate Properties. (Southern Methodist University Press, 1965).Google Scholar
- 45.H. Neilson, In Department of Materials Science and Engineering, (Case Western Reserve Universit, Cleveland 2018).Google Scholar
- 46.W.P. Mason: Physical Acoustics. 3rd ed. (Academic Press, New York 1965).Google Scholar
- 47.Smithells Metals Reference Book. 8E ed. (Elsevier Ltd., 2004).Google Scholar