Development in Light Weight Alloys and Composites: Microstructure, Processing and Mechanical Properties
Sponsored by: TMS Composite Materials Committee, TMS Materials Characterization Committee
Program Organizers: Ramasis Goswami, Naval Research Laboratory; Nikhil Gupta, New York University; Aashish Rohatgi, Pacific Northwest National Laboratory; Tanjore Jayaraman, United States Air Force Academy
Wednesday 2:00 PM
October 12, 2022
Room: 403
Location: David L. Lawrence Convention Center
Session Chair: Tanaji Paul, Florida International University; Aashish Rohatgi, PNNL
2:00 PM
Influence of Alkaline Earth Metals on Structure Formation and Magnesium Alloys Properties: Volodymyr Tsyganov1; Vadim Shalomeev1; Sergei Sheyko2; 1Zaporizhzhia Polytechnic National University; 2Zaporizhzhia National University
In this research were studied possibilities and were received the patterns of structure and properties of magnesium alloy improvement through its modifying by alkaline earth metals. The article scrutinizes separate and shared calcium and barium influence on macro and micro structure of system Mg-Al-Zn alloy. It is demonstrated, that alkaline earth metals were part of the complex intermetallic phases located in the grain center and served as additional centers of crystallization. The research provides patterns of separate and shared influence of alkaline earth metals on the casting properties complex from magnesium alloy. It is demonstrated that complex modifying (0,1 % Са + 0,1 % Ва) of magnesium alloy decreased the number of its structural components by a factor of 1,5, while increasing alloy durability by 20 %, plasticity by a factor of 2 and prolonged heat-resistence - 1,5.Keywords: magnesium alloys, modifying, structure, alkaline earth metals, crystallization
2:20 PM
Enhancing the Strength of Al-B4C Composites: Ramasis Goswami1; 1Naval Research Laboratory
We report here significant enhancement of hardness of aluminum-B4C composites by Mg alloy addition, deformation and subsequent annealing at high-homologous temperatures of the matrix. In this case the deformation induced plastic yielding enables the incorporation and dispersion of hard particles in Al-matrix. Interfacial AlMgB4 and Al3BC phases were observed at B4C/matrix interfaces as revealed by the high-resolution transmission electron microscopy and x-ray diffractions. We demonstrate the Mg addition improves interfacial cohesion significantly between the matrix and ceramic particles, and primarily contributes to the enhancement of strength. This provides a new method of developing Al based high-strength composites.
2:40 PM
The Effect of Si on Tungsten Aluminide Formation and Growth: Henry Young1; Raghavan Srinivasan1; Ammar Alyasari2; 1Wright State University; 2Middle Technical University
Tungsten aluminide is studied as a potential intermetallic reinforcement phase in aluminum alloys. The addition of silicon can affect intermetallic formation and growth. Laser Powder Bed Fusion (LPBF) was applied to a powder mixture of 10/90 W/AlSi12. Samples were then heat-treated at different conditions above and below the matrix melting point and examined using SEM, EDS, and XRD. The results were compared to pure Al/W composite prepared by spark plasma sintering (SPS). X-ray diffraction revealed Si, Al12W, Al5W, Al4W, tungsten silicides and andalusite compounds. The Al12W phase exhibits a fixed tungsten and silicon concentration. SEM imaging shows fast, faceted, growth of the Al12W precipitants with a hexagonal geometry. Silicon alloying reduces the matrix melting point and increases fluidity, facilitating the growth of intermetallics at lower temperatures compared to non-silicon materials.
3:00 PM
Investigation of the Residual Stress on AlSi10MnMg Alloy with Various Grain Size: Minjeong Jeon1; Eunkyung Lee1; 1Korea Maritime and Ocean University
AlSi10MnMg alloy with different initial grain size manufactured by high-pressure die casting(HPDC) and mold casting was subjected to T4 heat treatment and then furnace-cooled and water-quenched to control variables that could affect residual stress in addition to microstructure changes. The average grain size of non-heat treated HPDC and mold casting specimens was 12.21μm, 448.39μm, residual stress was 35MPa, 57MPa, and grain average misorientation(GAM) was 16.42, 12.19°, respectively. The average grain size of furnace-cooled HPDC and mold casting was 13.66μm, 658.81μm, residual stress was 42MPa, 89MPa, and GAM was 19.15°,13.98, respectively. The average grain size of water-quenched HPDC and mold casting specimens was 13.17μm, 123.85μm, residual stress was 56MPa, 67MPa, and GAM was 19.15°,13.98°. As the grain size decreases, the high angle grain boundary fraction is increased, and thus the high value of misorientation is distributed. Also, more dislocation piles up around large grains, resulting in greater residual stress values.
3:20 PM
Self-assembly and In-situ X-ray Diffraction Characterization of Two-dimensional Ti3C2Tx MXene in Al Matrices for Additive Manufacturing: Brian Wyatt1; Babak Anasori1; 1Indiana University - Purdue University Indianapolis
Two-dimensional transition metal carbides, known as MXenes, have wide applications in catalysis, energy storage, and electromagnetic shielding applications due to their interior transition metal carbide core and abundant hydrophilic surface groups. These key features of MXenes also make them useful candidates for tunable solution-based self-assembly processes to form lightweight metal matrix composites. In this talk, we present the tunable self-assembly process of single-to-few layer ~1 nm sheets of Ti3C2Tx MXene to micron-sized Al flakes that can be scaled for industry-scale powder beds. We also illustrate Ti3C2Tx’s mechanical reinforcement and morphological behavior during sintering using in-situ x-ray diffraction (XRD) with samples as low as 1 wt% Ti3C2Tx in Al. We also discuss the Vickers hardness properties and pre- and post-annealing morphology using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) methods. This talk aims to lay the foundation for future development of lightweight MXene-metal matrix composites for additive manufacturing applications.
3:40 PM Break
4:00 PM
Improving the Strength of AlCoCrNi Dual-phase High-entropy Alloy through ChemicalTtransformation: Zulfiya Usmonova1; Nurislombek Mahkamjonkhojizoda1; Malikabonu Sobirova1; Jakhongir Bakirov1; Elyorjon Jumaev1; 1New Uzbekistan University
To attain low density and good mechanical characteristics, a quaternary AlCoCrNi alloy was created by eliminating the heavy ingredient of Fe from the dual-phase AlCoCrFeNi high-entropy alloy. The Cr-rich A2 and Ni(Co)-Al-rich B2 phases of the AlCoCrNi alloy had a high degree of coherence in both dendritic and interdendritic areas, and the alloy had a nano-scale dual-phase structure. The non-stoichiometric composition between Ni and Al was discovered in the Ni(Co)-Al-rich B2 phase, which differed from the Ni-Al-rich B2 phase with a stoichiometric composition in the earlier AlCoCrFeNi high-entropy alloy. The mechanical characteristics of the dual-phase high-entropy alloy were heavily influenced by chemical development in the component phases. The mechanical characteristics of the AlCoCrNi alloy were extensively examined across a wide temperature range based on these microstructural features.
4:20 PM
The Role of Mo and Ti in Strengthening Mechanical Properties of the AlCrFeNi Eutectic High Entropy Alloys: Jakhongir Bakirov1; Malikabonu Sobirova1; Bunyodbek Ismoilov1; Zulfiya Usmonova1; Nurislombek Mahkamjonkhojizoda1; Firdavs Kutliev1; Elyorjon Jumaev1; 1New Uzbekistan University
The eutectic structure has been developed by adding minor elements such as Mo and Ti at 1, 3, and 5at% to the AlCrFeNi high entropy alloy. The aim of the work was to study mechanical behavior with double phase strengthening. The presence of B2 and BCC dual phases in the crystal structure was confirmed by an X-ray diffraction test. The addition of minor elements leads to the formation of eutectic alloy that is manifested by compositional variation in the alloy. The high degree of coherence of the morphology of the nanoscale Cr-Fe-rich A2 phase and Al-Ni-rich B2 phase in dendritic and lamellar regions was discovered during further analysis of the nanostructural evolution of the alloy. High-temperature hardness behavior was committed by the enhancement of mechanical properties being a result of variation in size of the grain on the nanoscale and volume fraction variation produced after adding minor elements.