@article{decker_berman_miller_jones_pollock_lebeau_2019, title={Alloy Design and Processing Design of Magnesium Alloys Using 2nd Phases}, volume={71}, ISSN={["1543-1851"]}, DOI={10.1007/s11837-019-03482-z}, abstractNote={Two phases dominate the performance of commercial Mg alloys: (1) β Mg17Al12 and (2) porosity. Alloy design and process design to optimize the morphology of the first and to minimize the second are discussed. Second phase β can be designed to improve tensile strength, fatigue strength, toughness, texture, formability and corrosion resistance of Mg alloys. Processing is applied to refine the grain size, to array this phase in micron sizes at grain boundaries, and to further precipitate this phase in nanometer arrays within the grains. Therein, the 2nd phase β plays the following roles: (1) retarding grain growth, (2) randomizing texture, (3) Hall–Petch hardening, (4) Orowan hardening, and (5) moderating corrosion. Porosity is a detrimental 2nd phase common to cast Mg alloys in the form of gas or voids; its control being essential to engineering applications. Porosity can be diminished by sub-liquidus molding with high-velocity/high-pressure injection and then eliminated by subsequent hot deformation.}, number={7}, journal={JOM}, author={Decker, R. F. and Berman, T. D. and Miller, V. M. and Jones, J. W. and Pollock, T. M. and LeBeau, S. E.}, year={2019}, month={Jul}, pages={2219–2226} }
 @article{anthony_dowdell_miller_2019, series={Minerals Metals & Materials Series}, title={Evolution of the Intermetallic Particle Distribution in Thixomolded Magnesium Alloys}, ISBN={2367-1181}, DOI={10.1007/978-3-030-05789-3_28}, abstractNote={The spatial distribution of intermetallic particles in magnesium alloys is critical to achieve a favorable combination of mechanical properties. The initial microstructure of Thixomolded alloys, with a fine homogeneous grain structure and intermetallic particle distribution, results in particularly favorable behavior. However, the as-molded microstructure is far from equilibrium. In this manuscript, the Thixomolded structure is characterized before and after heat treatment using electron microscopy.}, journal={MAGNESIUM TECHNOLOGY 2019}, author={Anthony, B. T. and Dowdell, B. G. and Miller, V. M.}, year={2019}, pages={193–197}, collection={Minerals Metals & Materials Series} }
 @article{stinville_martin_karadge_ismonov_soare_hanlon_sundaram_echlin_callahan_lenthe_et al._2018, title={Fatigue deformation in a polycrystalline nickel base superalloy at intermediate and high temperature: Competing failure modes}, volume={152}, ISSN={["1873-2453"]}, DOI={10.1016/j.actamat.2018.03.035}, abstractNote={The microstructural configurations that favor early strain localization and fatigue crack initiation at intermediate and high temperature (400 °C–650 °C) have been investigated using novel experimental techniques, including high resolution digital image correlation and transmission scanning electron microscopy. Cyclic fatigue experiments in the high and low cycle fatigue regimes have been performed on a René 88DT polycrystalline nickel-base superalloy at temperatures up to 650 °C and compared to previous fatigue results obtained from tests in the very high cycle fatigue regime. Competing failure modes are observed along with an inversion in the temperature fatigue life dependence of fatigue strength from the low to high cycle fatigue regime. Oxidation-assisted processes are dominant at high applied stresses while cyclic plastic localization and accumulation govern fracture at low applied stresses. In addition, a second competing mode exists in the high and very high cycle fatigue regime from non-metallic inclusions as compared to internal intrinsic initiation sites. The grain-scale features that exhibit strain localization and crack initiation were investigated in detail. Transmission electron microscopy (TEM), transmission scanning electron microscopy (TSEM) and electron channeling contrast imaging have been conducted on samples removed from targeted regions with microstructural configurations that favor crack initiation to characterize the associated dislocation sub-structure and its evolution with temperature. Plasticity is observed to be less localized during cyclic loading at high temperature compared to room temperature. The microstructural features that drive initiation across the temperature range investigated are: twin-parent grains pairs that are at the upper end of the size distribution, are oriented for near maximum elastic modulus mismatch, and have high stresses along planes parallel to the twin boundaries.}, journal={ACTA MATERIALIA}, author={Stinville, Jean Charles and Martin, Etienne and Karadge, Mallikarjun and Ismonov, Shak and Soare, Monica and Hanlon, Tim and Sundaram, Sairam and Echlin, McLean P. and Callahan, Patrick G. and Lenthe, William C. and et al.}, year={2018}, month={Jun}, pages={16–33} }
 @article{miller_agnew_2018, title={Integrated Computational Materials Engineering of Magnesium}, volume={70}, ISSN={["1543-1851"]}, DOI={10.1007/s11837-018-3042-6}, number={10}, journal={JOM}, author={Miller, V. M. and Agnew, S. R.}, year={2018}, month={Oct}, pages={2296–2297} }
 @article{miller_semiatin_szczepanski_pilchak_2018, title={Optimization of VPSC Model Parameters for Two-Phase Titanium Alloys: Flow Stress Vs Orientation Distribution Function Metrics}, volume={49A}, ISSN={["1543-1940"]}, DOI={10.1007/s11661-018-4716-y}, number={8}, journal={METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE}, author={Miller, V. M. and Semiatin, S. L. and Szczepanski, C. and Pilchak, A. L.}, year={2018}, month={Aug}, pages={3624–3636} }
 @article{stinville_echlin_callahan_miller_texier_bridier_bocher_pollock_2017, title={Measurement of Strain Localization Resulting from Monotonic and Cyclic Loading at 650 degrees C in Nickel Base Superalloys}, volume={57}, ISSN={["1741-2765"]}, DOI={10.1007/s11340-017-0286-y}, abstractNote={A methodology is presented for the use of the oxide scale that develops in polycrystalline Ni-base superalloys at service temperature, as a speckle pattern for μm-scale resolution strain measurements. Quantitative assessment of the heterogeneous strain field at the grain scale is performed by high-resolution SEM digital image correlation under monotonic and cyclic loading in polycrystalline Ni-base superalloys up to 650 ∘C. In the René 88DT superalloy, strain localization is observed near twin boundaries during low cycle fatigue (LCF) at intermediate temperatures, correlating with activation of {111} 〈110〉 and {111} 〈112〉 slip systems. A strong correlation between the microstructural configuration that promotes strain localization during monotonic loading and crack initiation at 650 ∘C in low cycle fatigue was observed.}, number={8}, journal={EXPERIMENTAL MECHANICS}, author={Stinville, J. C. and Echlin, M. P. and Callahan, P. G. and Miller, V. M. and Texier, D. and Bridier, F. and Bocher, P. and Pollock, T. M.}, year={2017}, month={Oct}, pages={1289–1309} }
 @article{miller_payton_pilchak_2017, title={Reduction in the thermodynamic nucleation barrier via the heteroepitaxial recrystallization mechanism}, volume={136}, ISSN={["1359-6462"]}, DOI={10.1016/j.scriptamat.2017.04.018}, abstractNote={A new recrystallization mechanism characterized by the formation of a coherent γ shell around a primary γ′ particle has been reported in superalloys [Charpagne et al. J. Alloy Compd. 688 (Part B) (2016) 685–694]. In the present work, the thermodynamics of nucleation by this mechanism are investigated, considering the stored deformation energy, interfacial energy, and elastic misfit. It is demonstrated that under realistic conditions, growth of any nucleus formed on a primary γ′ particle is thermodynamically favorable regardless of size.}, journal={SCRIPTA MATERIALIA}, author={Miller, V. M. and Payton, E. J. and Pilchak, A. L.}, year={2017}, month={Jul}, pages={128–131} }
 @article{echlin_stinville_miller_lenthe_pollock_2016, title={Incipient slip and long range plastic strain localization in microtextured Ti-6Al-4V titanium}, volume={114}, ISSN={1359-6454}, url={http://dx.doi.org/10.1016/J.ACTAMAT.2016.04.057}, DOI={10.1016/J.ACTAMAT.2016.04.057}, abstractNote={High resolution scanning electron microscope digital image correlation (SEM DIC) was performed in situ during uniaxial loading on Ti-6Al-4V rolled titanium plate to determine the dependence of strain localization on microstructure and microtexture. Individual grains with preferred orientation for basal slip exhibited plastic localization along basal planes before macroscopic yielding. With additional strain, but still below macroscopic yielding, pyramidal and prismatic plastic activity was observed as slip bands transmitting across many grains and entire microtextured regions (MTRs). The localization of long range plastic strain occurred within MTRs that allowed for slip transmission across grains with low angle boundaries. The rolled titanium plate material having strong [0001] and[101¯0]texture components showed pyramidal and prismatic type slip extending across entire MTRs at strains well below macroscopic yielding. These strain localization processes occur much earlier in straining and over lengthscales much longer than observed with conventional slip offset imaging. The implications for properties are discussed.}, journal={Acta Materialia}, publisher={Elsevier BV}, author={Echlin, McLean P. and Stinville, Jean Charles and Miller, Victoria M. and Lenthe, William C. and Pollock, Tresa M.}, year={2016}, month={Aug}, pages={164–175} }
 @article{miller_berman_beyerlein_jones_pollock_2016, title={Prediction of the plastic anisotropy of magnesium alloys with synthetic textures and implications for the effect of texture on formability}, volume={675}, ISSN={0921-5093}, url={http://dx.doi.org/10.1016/J.MSEA.2016.08.063}, DOI={10.1016/J.MSEA.2016.08.063}, abstractNote={Crystallographic texture is a well-known microstructural feature influencing the formability of magnesium alloys. However, the effects of individual texture characteristics common after thermomechanical processing have not been isolated due to the experimental challenge associated with varying them independently. Similarly, the effect of the propensity for twinning on formability, which both accommodates deformation and reorients the crystal, have not been systematically studied. This study uses synthetic sheet textures in conjunction with a viscoplastic self-consistent (VPSC) polycrystal plasticity model to predict deformation and formability behavior. The VPSC model was first parameterized based on experimental mechanical data and textures from fine-grained thixomolded and thermomechanically processed AZ61L. Subsequently, synthetic textures were generated to examine the effects of basal peak intensity, prismatic plane distribution, and asymmetry of the basal pole figure peak. Of these texture characteristics, basal peak strength is the most important predictor of forming behavior, with prismatic plane distribution and c-axis anisotropy resulting in comparatively weak effects. In the second part of the study, the effective critical resolved shear stress for twinning was varied, resulting in poorer forming behavior with easier twin activation. In both cases, increasing prismatic slip activity was deleterious to the predicted forming behavior.}, journal={Materials Science and Engineering: A}, publisher={Elsevier BV}, author={Miller, Victoria M. and Berman, Tracy D. and Beyerlein, Irene J. and Jones, J. Wayne and Pollock, Tresa M.}, year={2016}, month={Oct}, pages={345–360} }
 @article{miller_johnson_torbet_pollock_2016, title={Recrystallization and the Development of Abnormally Large Grains After Small Strain Deformation in a Polycrystalline Nickel-Based Superalloy}, volume={47}, ISSN={1073-5623 1543-1940}, url={http://dx.doi.org/10.1007/S11661-016-3329-6}, DOI={10.1007/S11661-016-3329-6}, number={4}, journal={Metallurgical and Materials Transactions A}, publisher={Springer Science and Business Media LLC}, author={Miller, Victoria M. and Johnson, Anthony E. and Torbet, Chris J. and Pollock, Tresa M.}, year={2016}, month={Jan}, pages={1566–1574} }
 @article{miller_pollock_2016, title={Texture Modification in a Magnesium-Aluminum-Calcium Alloy During Uniaxial Compression}, volume={47}, ISSN={1073-5623 1543-1940}, url={http://dx.doi.org/10.1007/S11661-016-3351-8}, DOI={10.1007/S11661-016-3351-8}, number={4}, journal={Metallurgical and Materials Transactions A}, publisher={Springer Science and Business Media LLC}, author={Miller, Victoria M. and Pollock, Tresa M.}, year={2016}, month={Jan}, pages={1854–1864} }
 @article{douglas_birkel_verma_miller_miao_stucky_pollock_seshadri_2014, title={Phase stability and property evolution of biphasic Ti–Ni–Sn alloys for use in thermoelectric applications}, volume={115}, ISSN={0021-8979 1089-7550}, url={http://dx.doi.org/10.1063/1.4862955}, DOI={10.1063/1.4862955}, abstractNote={Thermoelectric properties and phase evolution have been studied in biphasic Ti–Ni–Sn materials containing full-Heusler TiNi2Sn embedded within half-Heusler thermoelectric TiNiSn. Materials, prepared by levitation induction melting followed by annealing, were of the nominal starting composition of TiNi1+xSn, with x between 0.00 and 0.25. Phases and microstructure were determined using synchrotron X-ray diffraction and optical and electron microscopy. The full-Heusler phase is observed to be semi-coherent with the half-Heusler majority phase. Differential thermal analysis was performed to determine melting temperatures of the end-member compounds. The thermal conductivity is reduced with the introduction of a dispersed, full-Heusler phase within the half-Heusler material. This leads to an increased thermoelectric figure of merit, ZT, from 0.35 for the stoichiometric compound to 0.44 for TiNi1.15Sn. Beyond x = 0.15 ZT decreases due to a rise in thermal conductivity. Density functional theory calculations usi...}, number={4}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Douglas, Jason E. and Birkel, Christina S. and Verma, Nisha and Miller, Victoria M. and Miao, Mao-Sheng and Stucky, Galen D. and Pollock, Tresa M. and Seshadri, Ram}, year={2014}, month={Jan}, pages={043720} }