Metal-Matrix Composites: Analysis, Modeling, Observations and Interpretations: Mechanical Properties and Performance
Sponsored by: TMS Structural Materials Division, TMS: Composite Materials Committee
Program Organizers: Srivatsan Tirumalai; Yuzheng Zhang, Gamma Alloys; William Harrigan, Gamma Alloys
Tuesday 8:30 AM
February 25, 2020
Room: 31A
Location: San Diego Convention Ctr
Session Chair: Nikhilesh Chawla, Arizona State University
8:30 AM Invited
In-situ Synthesis of Al/Al2O3 Nanocomposites via Spark Plasma Sintering of Nano-sized Al Powders: Yaojun Lin1; Zhigang Yan2; Zhibo Liu1; Fei Chen1; Enrique Lavernia3; 1Wuhan University of Technology; 2Yanshan University; 3University of California, Irvine
We report on our research efforts related to the in situ synthesis of Al/Al2O3 nanocomposites via spark plasma sintering (SPS) followed by plastic deformation, including either hot extrusion or high pressure torsion (HPT). Our results show that during SPS the oxide films on Al powder surfaces are disrupted into nano-scale oxide particles at grain boundaries (GBs) by strong pulsed electric discharge and the oxide particles effectively retarded nano-sized grain growth. Plastic deformation redistributes the nano-scale oxide particles at both GBs and grain interiors, but induces grain growth to an ultra-fine regime. Microstructures in as-SPS, extruded and HPT Al/Al2O3 nanocomposites are presented. The mechanical properties of Al/Al2O3 nanocomposites are measured via tensile testing. Our results show that plastic deformation can improve both strength and ductility of the Al/Al2O3 nanocomposites. Based on the results in the present work, we discuss the future directions to further enhance strength and ductility of Al/Al2O3 nanocomposites.
9:00 AM Invited
The Microstructure and Mechanical Properties of Magnesium-based Composites: Role of Reinforcement and Processing: Sankaranarayanan Seetharaman1; Jayalakshmi Subramanian2; Arvind Singh2; Srivatsan Tirumalai. S.3; Manoj Gupta3; 1Ansys Inc; 2Wenzhou University; 3The University of Akron
In this presentation, magnesium-based alloys reinforced with micron-sized titanium [Ti] particulates along with varying amounts of nano-sized particulates of silicon carbide [SiC] and synthesized using the technique of Disintegrated Melt Deposition [DMD] followed by hot extrusion will be highlighted. Influence of hybrid reinforcement on microstructural development of the binary composite was determined and influence of microstructure on mechanical properties established. Microstructure and properties of the hybrid composite are compared with a Mg-5.6 Ti alloy. An examination of microstructure revealed a refinement in grain size of the as-synthesized composites. This is attributed to the presence of a uniform distribution of micron-sized titanium particles along with nano-sized SiC particles coupled with resultant highly localized recrystallization. Determination of mechanical properties revealed best combination of strength and ductility for the Mg (5.6 Ti + 1.0 SiC) hybrid composite. The influence of hybrid reinforcement on microstructural development and mechanical properties will be highlighted.
9:30 AM
The Effect of Solution Treatment Aging on Hardness Improvement of Ti-6Al-4V/TiC Metal Matrix Composite: James Penney1; Sergey Prikhodko1; Pavlo Markovsky2; Dmytro Savvakin2; Olek Stasuik2; 1University of California, Los Angeles; 2G.V. Kurdyumov Institute for Metal Physics NAS of Ukraine
Discontinuously reinforced Ti alloys fabricated using low-cost powder metallurgy processes attracts significant attention due to prospective of major improvement in hardness and exceptional wear resistance of the light host metal. In this study, structures of metal-matrix composites (MMC) of Ti-6Al-4V alloy reinforced with hard particles of TiC (0-60%, vol.) were fabricated using blended elemental powder metallurgy (BEPM) with hydrogenated Ti as the base. Post-sintering solution treatment aging (STA) at 880 and 1000°C for 45min, followed by water quenching at 550°C for 5h was employed to improve the microstructure and properties. During thermal exposures of primary and secondary processing, the matrix and reinforcement particles retain their separate identity. It was found that the thermal treatment of MMC used leads to an increase of hardness of up to fifty percent compared to as-sintered condition. The material was characterized, and property changes were explained using light optical microscopy, SEM-EDS, EBSD, TEM and XRD.
9:55 AM Break
10:15 AM
Mechanical Properties of Al-based Metal Matrix Composites Produced by Constrained High Pressure Torsion: Galiia Korznikova1; Rinat Kabirov1; Konstantin Nazarov1; Rinat Khisamov1; Radik Mulyukov1; 1IMSP RAS
Metal matrix composites based on aluminum have high specific strength, hardness and wear resistance, fatigue strength. Shear deformation under pressure due to high shear strains allows not only to form a nanostructure, but also to join immiscible metals. Here we report the results obtained on sandwich-type Al-Cu-Al composite samples obtained by shearing under pressure of the initial coarse-grained aluminum and copper plates. The values of the composite tensile strength reached 485 MPa, which is several times higher than in pure aluminum (80 MPa) and copper (190 MPa) subjected to the same processing. Such an increase in the ultimate strength is associated with the formation of a multiphase fine grained structure and a some change in the deformation mechanism. The present work was accomplished according to the state assignment of IMSP RAS and supported by the Russian Science Foundation (Grant No. 18-12-00440)
10:40 AM Invited
A 3D Multiple-Slip Crystal Plasticity Model for Precipitate Hardening in Additively Manufactured High-Strength Steels: Moustafa AbdelHamid1; Tarek Hatem2; 1Nile University; 2The British University in Egypt
Additive Manufacturing (AM) revolutionized the manufacturing of complexgeometry products, especially in medical and aerospace fields. High-strength precipitate hardened (PH) stainless steels provide unique properties in term-of strength and corrosion resistance for critical applications in both fields. In the current study, a 3D multiple-slip crystal-plasticity dislocation-densities based model is used to study the effect of copper precipitate hardening in high-strength stainless steels. The proposed approach accurately predicts the complex structure of martensite and properly represents the precipitates, based on its characteristics, such as: texture, morphology, secondary phases and initial-dislocations-densities. The results show the effect of materials’ characteristics on mechanical properties and failure of AM-PH high-strength steels. The current work lays the groundwork for more extensive work of AM modeling.
11:05 AM Cancelled
Effect of Prestrain on Tensile Property of TiNif/Mg Composite: Chenri Jin1; Suyuan Yang1; Yuyang He1; Dan Guo1; Xingwang Cheng1; 1Beijing Institute of Technology
A TiNi shape memory alloy fiber reinforced AZ31 magnesium alloy matrix composite was fabricated by spark plasma sintering. Microstructure of the composite and effect of prestrain on strength enhancement were analyzed. Phase transformation of TiNi was observed in situ and the effect of temperature was involved. Results show that the interface between TiNi fiber and AZ31 matrix had a good combination. Strengthening effect of prestrain on yield stress of the composite at room temperature was more remarkable than 373 K and the effect decreased with increasing prestrain. Strengthening effect of prestrain on tensile strength of the composite was efficacious at both RT and 373 K. Due to the difference between recovery stress of TiNi and prestrain-caused compressive stress, the strengthening effect of increasing temperature was more significant than applying prestrain.