Microstructural Evolution and Mechanical Properties of Graphene-Reinforced Ti-6Al-4V Composites Synthesized via Spark Plasma Sintering
Abstract
:1. Introduction
2. Experimental Procedure
2.1. Raw Materials
2.2. Preparation Process of the Composites
- (I)
- Preparation of the composite powders. The different contents of GNPs were mixed with TC4 pre-alloyed powders by using a low energy ball mill (QM-3SP2, Nanda instrument plant, Nanjing, China) with the speed of 300 rpm for 16 h under Ar atmosphere. The mixed powders were put into a zirconia ceramics vial with the zirconia ceramics balls. The diameters of the stainless steel balls are 10 mm and 6 mm, respectively. The weight ratio of the large ball and the small ball was 1:1. The weight ratio of the mixed powder and the ball was 1:10. Identification code of each composite prepared in this work is the followings, Ti6Al4V-Graphene (TG), TG0.2, TG0.4, TG0.6, and TG0.8 is assigned to the composites with 0–0.8 wt. % of GNPs, respectively.
- (II)
- Sintering of the composite powders. Five mixed powders (TG, TG0.2, TG0.4, TG0.6, and TG0.8) were sintered by SPS machine (labox-1575, sinter land, Nagaoka, Japan). Firstly, the mixed powders were filled into the graphite mold, and then two graphite punches were pressed on the powders. The GNPs/TC4 composites were fabricated for 40min at 1200 °C with a heating rate of 100 °C, under unit pressure of 50 MPa. After sintering, the sintered compact was cooled to the room temperature (RT) in the furnace. Finally, the sintered composites of Ø20 mm × 12 mm were obtained (Figure 2).
2.3. Microstructure Characterization and Mechanical Properties Testing
3. Results and Discussion
3.1. Microstructures of the Mixed Powders
3.2. Microstructure of the Sintered GNPs/TC4 Composites
3.3. Mechanical Properties
- (1)
- The shear lag model [36] is an important model to explain the strengthening mechanism. Addition of GNPs are beneficial for transferring of the load from the matrix to the GNPs and the in-situ TiC, but the interfacial shear stress was produced during the stress transfer process. Thus, the interfacial bond affects the strength of the composite. The result of this work increasing the strength of the composite. Based on the shear lag model, yield strength of the GNPs/TC4 composite can be expressed using:
- (2)
- Orowan strengthening is another strengthening mechanism of the GNP/TC4 composite compared to the monolithic TC4 alloy [38]. The addition of GNPs can improve the strength of the composites. The yield strength of the GNPs/TC4 composite based on the Orowan model, is showed as follows:
4. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Wang, W.; Zhou, H.; Wang, Q.; Wei, B.; Xin, S.; Gao, Y. Microstructural Evolution and Mechanical Properties of Graphene-Reinforced Ti-6Al-4V Composites Synthesized via Spark Plasma Sintering. Metals 2020, 10, 737. https://doi.org/10.3390/met10060737
Wang W, Zhou H, Wang Q, Wei B, Xin S, Gao Y. Microstructural Evolution and Mechanical Properties of Graphene-Reinforced Ti-6Al-4V Composites Synthesized via Spark Plasma Sintering. Metals. 2020; 10(6):737. https://doi.org/10.3390/met10060737
Chicago/Turabian StyleWang, Wei, Haixiong Zhou, Qingjuan Wang, Baojia Wei, Shewei Xin, and Yuan Gao. 2020. "Microstructural Evolution and Mechanical Properties of Graphene-Reinforced Ti-6Al-4V Composites Synthesized via Spark Plasma Sintering" Metals 10, no. 6: 737. https://doi.org/10.3390/met10060737