February AMP_Digital

A D V A N C E D M A T E R I A L S & P R O C E S S E S | F E B R U A R Y / M A R C H 2 0 1 9 2 6 Teflon-coated mold. Different compo- sitions were then allowed to cure for 12 h. Cured samples were then demold- ed from the mold and had a diameter of ~48 mm. Coupons for tensile test- ing were then cut from the sample with scissors. The length, width, gauge length, and thickness of the coupons was roughly 48, 5.5, 15, and 0.3 mm, re- spectively. Coupons for tensile testing were then further dried for ~24 h. Some samples curled during the drying pro- cess. The process was then repeated for those samples. All samples were then tested in tension by using a mechanical testing unit (Shimadzu AD-IS UTM, Shimadzu Scientific Instruments, Columbia, Md.) at a deflection rate of 5 mm/min. The maximum value of stress reached by a sample before failure is recorded as ul- timate tensile stress (UTS). In this study, an average of five tests for each com- position was performed to report the mean UTS for that composition. Pol- ished samples were mounted on alumi- num mounts and coated with Au/Pd by using a Balzers SCD 030 sputter coater (BAL-TEC RMC, Tucson, Ariz.). The mi- crostructure of the composites was also characterized by a JEOL JSM-6490LV scanning electron microscope (JEOL USA) in SE and BSE mode. ~AM&P Acknowledgment This work was funded by ND Venture and NASA EPSCoR. For more information: Surojit Gupta, associate professor, Advanced Materi- als Research Group, University of North Dakota, 243 Centennial Dr., Grand Forks, ND, 58201, 701.777.1632, surojit. gupta@und.edu. References 1. M. Ade and H. Hillebrecht, Ternary Borides Cr 2 AlB 2 , Cr 3 AlB 4 , and Cr 4 AlB 6 : The First Members of the Series (CrB 2 ) n CrAl with n = 1, 2, 3 and a Unifying Concept for Ternary Borides as MAB- Phases, Inorg. Chem., 54, p 6122−6135, 2015. 2. M.W. Barsoum and T. El-Raghy, Synthesis and Charac- terization of a Remark- able Ceramic: Ti 3 SiC 2 , J. Am. Ceram. Soc., 79, p 1953-1956, 1996. 3. A Progress Report on Ti 3 SiC 2 , Ti 3 GeC 2 , and the H-phases, M 2 BX, J. Matls. 20, Synthesis and Processing, 5, p 197-216, 1997. 4. N.V. Tzenov and M.W. Barsoum, Syn- thesis and Charac- terization of Ti 3 AlC 2 , J. Am. Ceram. Soc., 83, p 825-832, 2000. 5. Physical Proper- ties of the MAX Phases, Encyclopedia of Mater- ials: Science and Tech- nology, Bushow, et al., Eds., 2006. 6. M. Naguib, et al., Two-Dimensional Na- nocrystals Produced by Exfoliation of Ti 3 AlC 2 , Adv. Mater., 23, p 4248-4253, 2011. 7. M. Ghidiu, et al., Conductive Two- Dimensional Titanium Carbide Clay with High Volumetric Capacitance, Nature, 516, p 78-81, 2014. 8. S. Kota, Synthesis and Charac- terization of an Alumina Forming Nano-laminated Boride: MoAlB, Scien- tific Reports, 6:26475, DOI: 10.1038/ srep26475. 9. N. Li, et al., Rapid Synthesis, Elec- trical, and Mechanical Properties of Polycrystalline Fe 2 AlB 2 Bulk from Ele- mental Powders, J. Am. Ceram. Soc. 100, p 4407-4411, 2017. 10. S. Kota, et al., Synthesis and Characterization of the Atomic Lami- nate Mn 2 AlB 2 , J. European Ceram. Soc., 38, p 5333-5340, 2018. 11. L. Xua, et al., Synthesis, Micro- structure and Properties of MoAlB Cer- amics, Ceram. Intl., 44, p 13396-13401, 2018. 12. M. Fuka, M. Dey, and S. Gupta, Novel Ternary Boride (MoAlB) Particulates as Solid Lubricant Additives in Ni-matrix Composites, 2018 Joint Propulsion Conf., AIAA Propulsion and Energy Forum, (AIAA 2018-4893), https://doi. org/10.2514/6.2018-4893. 13. S. Gupta and M. Fuka, Synthesis of MoAlB Particulates and Their Porous Derivatives by Selective Deintercalation of Al from MoAlB, in: Sun Z., et al., (Eds.), Ener. Technol. 2018, The Min- erals, Metals & Materials Series, Springer. 14. L.T. Alameda, et al., Partial Etch- ing of Al from MoAlB Single Crystals to Expose Catalytically Active Basal Planes for the Hydrogen Evolution Reaction, Chem. Mater., 29, p 8953- 8957, 2017. 15. L.T. Alameda, et al., Topochemical Deintercalation of Al from MoAlB: Stepwise Etching Pathway, Layered In- tergrowth Structures, and Two-Dimen- sional MBene, J. Am. Chem. Soc., 140, p 8833-8840, 2018.