Microstructure and Mechanical Behavior of Cryomilled Al–Mg Composites Reinforced with Nanometric Yttria Partially Stabilized Zirconia
The present work investigated the viability of using nanometric 3 mol% yttria partially stabilized zirconia (3YSZ) as a particulate reinforcement in ultrafine grained aluminum alloy matrix composites. Four types of composite materials, with variable amounts of coarse grain regions and volume fractions of 3YSZ, were fabricated through cryomilling and hot isostatic pressing; one of the materials was extruded. Al–Mg alloy (AA5083) was selected as the matrix alloy. Microstructural characterization revealed that the 3YSZ particles were well dispersed in the Al matrix. The grain sizes of the Al matrix ranged from 77 ± 41 to 362 ± 185 nm depending on the thermomechanical processing. The composite with 2.2 vol% 3YSZ exhibited an ultimate tensile strength of 795 MPa and a strain-to-failure of 1.84%. In contrast, the composite with 10 vol% 3YSZ exhibited an ultimate compressive strength of 611 MPa with 22.5% strain-to-failure; this composite also retained 30% of its room temperature strength at 673 K (400 ℃). Evaluation of strengthening mechanisms suggests that Hall-Petch strengthening is a predominant mechanism controlling the achieved strength.
KeywordsAl alloy matrix composites Ultrafine grained structure Yttria-stabilized zirconia Mechanical behavior
Financial support from the Office of Naval Research (Grant Nos. N00014-12-1-0237 and N00014-12-C-0241) is gratefully acknowledged. Additionally, the authors would like to thank Daiichi Kigenso Kagaku Kogyo Co., Ltd. for complimentary supply of the 3YSZ powder used in Materials B and C in this study.
- 5.Ma K, Lavernia EJ, Schoenung JM (2017) Particulate reinforced aluminum alloy matrix composites—a review on the effect of microconstituents. Rev Adv Mater Sci 48:91–104Google Scholar
- 8.Jiang L, Ma K, Yang H, Li M, Lavernia EJ, Schoenung JM (2014) The microstructural design of trimodal aluminum composites. JOM 66:898–908 Google Scholar
- 27.Huang S, Binner J, Vaidhyanathan B, Brown P, Hampson C, Spacie C (2011) Development of nano zirconia toughened alumina for ceramic armor applications. In: Advances in ceramic armor VII. Wiley, pp 103–113Google Scholar
- 38.Topping TD (2012) Materials science and engineering. University of California, Davis, CAGoogle Scholar
- 39.Ye J (2006) Materials science and engineering. University of California, DavisGoogle Scholar
- 45.Newbery AP, Ahn B, Pao P, Nutt S, Lavernia E (2007) A ductile UFG Al Alloy via cryomilling and quasi-isostatic forging. Adv Mater Res 29–30:21–29 Google Scholar
- 47.Petch NJ (1953) The cleavage strength of polycrystals. J Iron Steel Inst 174:25–28Google Scholar
- 49.Davis JR (1993) Aluminum and aluminum alloys. ASM International, Materials ParkGoogle Scholar
- 50.Tsukuma K, Ueda K, Matsushita K, Shimada M (1985) High‐temperature strength and fracture toughness of Y2O3‐partially‐stabilized ZrO2/Al2O3 composites. J Am Ceram Soc 68:C-56–C-58Google Scholar