Influence of Heat Treatment on the Microstructure Evolution and Mechanical Properties of Graphene/Ti 2 AlNb Composites S
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Influence of Heat Treatment on the Microstructure Evolution and Mechanical Properties of Graphene/Ti2AlNb Composites Synthesized via Spark Plasma Sintering Wei Wang, Ziru Han, Qingjuan Wang, Baojia Wei, Shewei Xin, and Kuaishe Wang (Submitted March 29, 2020; in revised form May 30, 2020; Accepted September 12, 2020) Ti2AlNb-based composites with different contents of graphene nanoplatelets (GNPs) were prepared by high-energy ball milling and spark plasma sintering (SPS) under vacuum conditions. The effects of heat treatment on microstructures and mechanical behaviors of the composites were also evaluated. The results showed the layer structures of GNPs were retained in the composite and a small number of in situ TiC were formed during SPS. When GNPs contents increases to 0.2 wt.%, compared with pure Ti2AlNb alloy, the ultimate compressive strength (UCS) of the composites after solid solution (960 °C + 3 h) was increased by 13.35% and exceeded 1500 MPa. After further aging treatment (760 °C + 12 h), the UCS of the composites with 0.2 wt.% GNPs was reached to 1700 MPa. Keywords
graphene nanoplatelets, microstructure evolution, Ti2AlNb-based composites, strengthening mechanism
1. Introduction In recent decades, with the development of aerospace industry, the requirements for the mechanical properties of aviation materials were further improved. Ti2AlNb-based alloy with the addition of Nb element as a promising lightweight and high-temperature structural material has a wide application prospect in aerospace (Ref 1-4). Due to its advantages of the high temperature strength, better room temperature ductility, low density and high creep resistance, Ti2AlNb alloy has become the base material of titanium matrix composite (Ref 5, 6). In previous investigations, Ti2AlNb-based composites reinforced by different kinds of the reinforced materials, such as SiC monofilaments (Ref 1, 3-6), TiC (Ref 7), TiB particles (Ref 8, 9) have also received great attention because of its wide applications in the complex environmental conditions of the aerospace industry. Among the particle reinforcements, GNPs has shows remarkable thermal, electrical and mechanical properties with its combination of large specific surface area (2630 m2/g) and high aspect ratio. The GNPs and their derivatives have been tried to be added into the matrix of polymer (Ref 10), ceramics (Ref 11) and metal (Ref 12) by lot of researchers. And the mechanical properties of the composites have been remarkable increased (Ref 13-17). At present, graphene-reinforced Ti Wei Wang, Ziru Han, Qingjuan Wang, and Kuaishe Wang, School of Metallurgy Engineering, XiÕan University of Architecture and Technology, XiÕan 710055, China; Baojia Wei, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China; and Shewei Xin, Titanium Alloy Institute, Northwest Institute for Nonferrous Metal Research, XiÕan 710016, China. Contact e-mails: [email protected] and [email protected].
Journal of Materials Engineering and Perfor
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