Raymundo Arroyave
Texas A&M University
Work (thermodynamics)Density functional theoryComposite materialChemistryMartensiteMetallurgyMaterials scienceCondensed matter physicsIntermetallicAlloyComputer sciencePhase (matter)Shape-memory alloyTernary operationDiffusionless transformationCrystallographyPhase diagramMicrostructureCALPHADThermodynamics
Publications 253
#1Danial Khatamsaz (A&M: Texas A&M University)H-Index: 2
#2Abhilash Molkeri (A&M: Texas A&M University)H-Index: 4
Last. Douglas Allaire (A&M: Texas A&M University)H-Index: 18
view all 7 authors...
#1Bing Zhang (A&M: Texas A&M University)H-Index: 4
#2Raiyan Seede (A&M: Texas A&M University)H-Index: 4
Last. Alaa Elwany (A&M: Texas A&M University)H-Index: 22
view all 9 authors...
Abstract null null Typically, the development of materials is intimately tied to the concurrent development of manufacturing technologies especially suitable to that material. In the case of metal additive manufacturing (AM), in contrast, the alloys typically used a feedstock were originally developed having other traditional manufacturing technologies in mind. Since metal AM processes involve fundamentally different physics, it is common to encounter many challenges when processing these materi...
1 CitationsSource
#1Raiyan Seede (A&M: Texas A&M University)H-Index: 4
#2Jiahui Ye (A&M: Texas A&M University)
Last. Ibrahim Karaman (A&M: Texas A&M University)H-Index: 70
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Abstract null null Additive manufacturing (AM) has gained considerable academic and industrial interest due to its ability to produce parts with complex geometries with the potential for local microstructural control. However, due to the large number of material and process variables associated with AM, optimization of alloying compositions and process parameters to achieve desired properties is an arduous task. There is a fundamental gap in understanding how changes in process variables, and al...
#1Raiyan Seede (A&M: Texas A&M University)H-Index: 4
#2Bing Zhang (A&M: Texas A&M University)H-Index: 4
Last. Ibrahim Karaman (A&M: Texas A&M University)H-Index: 70
view all 9 authors...
Abstract null null A newly developed ultra-high strength martensitic steel, AF9628, has generated academic and industrial attention due to its combination of high yield strength and ductility at a low cost. Several studies have demonstrated that this steel can be successfully additively manufactured (AM) using laser powder bed fusion (LPBF). However, as-printed parts have displayed microstructural inhomogeneity, anisotropy, and a discrepancy in mechanical properties as compared to the traditiona...
#4Chen Zhang (A&M: Texas A&M University)H-Index: 1
Abstract null null Laser Powder Bed Fusion (L-PBF) was utilized to fabricate fully dense, near-equiatomic (Ni50.1Ti49.9) and Ni-rich NiTi (Ni50.8Ti49.2) shape memory alloy (SMA) parts which exhibited tensile ductility up to 16%, shape memory strain of 6%, and tensile superelasticity up to 4%. Annealing heat treatments marginally improved the superelasticity of the as-fabricated Ni-rich NiTi parts due to the formation of a small volume fraction of Ni4Ti3 precipitates. The selection of optimum pro...
#1Prashant SinghH-Index: 6
#1Prashant SinghH-Index: 58
Last. Duane D. JohnsonH-Index: 54
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High-entropy alloys (HEAs), and even medium-entropy alloys (MEAs), are an intriguing class of materials in that structure and property relations can be controlled via alloying and chemical disorder over wide ranges in the composition space. Employing density-functional theory combined with the coherent-potential approximation to average over all chemical configurations, we tune free energies between face-centered-cubic (fcc) and hexagonal-close-packed (hcp) phases in Fe_{x}n_{80-x}o_{10}..
#1Bing ZhangH-Index: 4
#2Raiyan SeedeH-Index: 4
Last. Alaa ElwanyH-Index: 22
view all 8 authors...
#2Prashant Singh (DOE: United States Department of Energy)H-Index: 9
#2Prashant SinghH-Index: 18
Last. Serhiy Z. Malynych (Army and Navy Academy)H-Index: 9
view all 10 authors...
#1Prashant Singh (A&M: Texas A&M University)H-Index: 9
#2Daniel J. Sauceda (A&M: Texas A&M University)H-Index: 3
Last. Raymundo Arroyave (A&M: Texas A&M University)H-Index: 33
view all 3 authors...
Abstract The Zr-based MAX phases have attracted considerable attention for their outstanding irradiation behavior and high neutron transparency relevant to nuclear power generation technologies. In spite of increased understanding of physical behavior crystalline MAX phases, the high-temperature oxidation behavior and reaction mechanism of disordered MAX phases both from theory and experiments are not well understood due to increased system complexity. Here, we present a detailed comparative ass...
#1Prashant Singh (Ames Laboratory)H-Index: 9
#2Debashish Das (IITB: Indian Institute of Technology Bombay)H-Index: 1
Last. Aftab Alam (IITB: Indian Institute of Technology Bombay)H-Index: 17
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We present a systematic study of the effect of Pd-alloying on phase stability, electronic structure, and elastic properties in L1_{0}Fe-Ni using density-functional theory. Being from the same group of the periodic table, Pd is the best candidate for chemical alloying . The Fe-Ni/Fe-Pd/Ni-Pd bond-length increases with increasing Pd-concentration, which weakens the hybridization between low lying energy states below Fermi-level. The reduced hybridization decreases the relative thermodynamic sta...