[{"citation":{"ista":"Cheng B, Leung HS, Ngan AHW. 2014. Strength of metals under vibrations – dislocation-density-function dynamics simulations. Philosophical Magazine. 95(16–18), 1845–1865.","short":"B. Cheng, H.S. Leung, A.H.W. Ngan, Philosophical Magazine 95 (2014) 1845–1865.","mla":"Cheng, Bingqing, et al. “Strength of Metals under Vibrations – Dislocation-Density-Function Dynamics Simulations.” <i>Philosophical Magazine</i>, vol. 95, no. 16–18, Taylor &#38; Francis, 2014, pp. 1845–65, doi:<a href=\"https://doi.org/10.1080/14786435.2014.897008\">10.1080/14786435.2014.897008</a>.","ieee":"B. Cheng, H. S. Leung, and A. H. W. Ngan, “Strength of metals under vibrations – dislocation-density-function dynamics simulations,” <i>Philosophical Magazine</i>, vol. 95, no. 16–18. Taylor &#38; Francis, pp. 1845–1865, 2014.","chicago":"Cheng, Bingqing, H.S. Leung, and A.H.W. Ngan. “Strength of Metals under Vibrations – Dislocation-Density-Function Dynamics Simulations.” <i>Philosophical Magazine</i>. Taylor &#38; Francis, 2014. <a href=\"https://doi.org/10.1080/14786435.2014.897008\">https://doi.org/10.1080/14786435.2014.897008</a>.","ama":"Cheng B, Leung HS, Ngan AHW. Strength of metals under vibrations – dislocation-density-function dynamics simulations. <i>Philosophical Magazine</i>. 2014;95(16-18):1845-1865. doi:<a href=\"https://doi.org/10.1080/14786435.2014.897008\">10.1080/14786435.2014.897008</a>","apa":"Cheng, B., Leung, H. S., &#38; Ngan, A. H. W. (2014). Strength of metals under vibrations – dislocation-density-function dynamics simulations. <i>Philosophical Magazine</i>. Taylor &#38; Francis. <a href=\"https://doi.org/10.1080/14786435.2014.897008\">https://doi.org/10.1080/14786435.2014.897008</a>"},"year":"2014","date_updated":"2023-02-23T14:04:59Z","type":"journal_article","date_published":"2014-06-23T00:00:00Z","publication_identifier":{"eissn":["1478-6443"],"issn":["1478-6435"]},"day":"23","doi":"10.1080/14786435.2014.897008","abstract":[{"lang":"eng","text":"It is well known that ultrasonic vibration can soften metals, and this phenomenon has been widely exploited in industrial applications concerning metal forming and bonding. Recent experiments show that the simultaneous application of oscillatory stresses from audible to ultrasonic frequency ranges can lead to not only softening but also significant dislocation annihilation and subgrain formation in metal samples from the nano- to macro-size range. These findings indicate that the existing understanding of ultrasound softening – that the vibrations either impose additional stress waves to augment the quasi-static applied load, or cause heating of the metal, whereas the metal’s intrinsic deformation resistance or mechanism remains unaltered – is far from complete. To understand the softening and the associated enhanced subgrain formation and dislocation annihilation, a new simulator based on the dynamics of dislocation-density functions is employed. This new simulator considers the flux, production and annihilation, as well as the Taylor and elastic interactions between dislocation densities. Softening during vibrations as well as enhanced cell formation is predicted. The simulations reveal the main mechanism for subcell formation under oscillatory loadings to be the enhanced elimination of statistically stored dislocations (SSDs) by the oscillatory stress, leaving behind geometrically necessary dislocations with low Schmid factors which then form the subgrain walls. The oscillatory stress helps the depletion of the SSDs, because the chance for them to meet up and annihilate is increased with reversals of dislocation motions. This is the first simulation effort to successfully predict the cell formation phenomenon under vibratory loadings."}],"volume":95,"status":"public","user_id":"6785fbc1-c503-11eb-8a32-93094b40e1cf","extern":"1","scopus_import":"1","_id":"9686","publication":"Philosophical Magazine","issue":"16-18","author":[{"full_name":"Cheng, Bingqing","orcid":"0000-0002-3584-9632","last_name":"Cheng","first_name":"Bingqing","id":"cbe3cda4-d82c-11eb-8dc7-8ff94289fcc9"},{"full_name":"Leung, H.S.","last_name":"Leung","first_name":"H.S."},{"first_name":"A.H.W.","last_name":"Ngan","full_name":"Ngan, A.H.W."}],"article_processing_charge":"No","date_created":"2021-07-19T09:27:15Z","oa_version":"None","publication_status":"published","intvolume":"        95","title":"Strength of metals under vibrations – dislocation-density-function dynamics simulations","month":"06","quality_controlled":"1","page":"1845-1865","language":[{"iso":"eng"}],"publisher":"Taylor & Francis","article_type":"original"},{"type":"journal_article","date_published":"2009-08-21T00:00:00Z","citation":{"ista":"Yang X-D, Riseborough PS, Modic KA, Fisher RA, Opeil CP, Finlayson TR, Cooley JC, Smith JL, Goddard PA, Silhanek AV, Lashley JC. 2009. Influence of magnetic fields on structural martensitic transitions. Philosophical Magazine. 89(22–24), 2083–2091.","mla":"Yang, X. D., et al. “Influence of Magnetic Fields on Structural Martensitic Transitions.” <i>Philosophical Magazine</i>, vol. 89, no. 22–24, Taylor &#38; Francis, 2009, pp. 2083–91, doi:<a href=\"https://doi.org/10.1080/14786430902865518\">10.1080/14786430902865518</a>.","short":"X.-D. Yang, P.S. Riseborough, K.A. Modic, R.A. Fisher, C.P. Opeil, T.R. Finlayson, J.C. Cooley, J.L. Smith, P.A. Goddard, A.V. Silhanek, J.C. Lashley, Philosophical Magazine 89 (2009) 2083–2091.","chicago":"Yang, X.-D., P.S. Riseborough, Kimberly A Modic, R.A. Fisher, C.P. Opeil, T.R. Finlayson, J.C. Cooley, et al. “Influence of Magnetic Fields on Structural Martensitic Transitions.” <i>Philosophical Magazine</i>. Taylor &#38; Francis, 2009. <a href=\"https://doi.org/10.1080/14786430902865518\">https://doi.org/10.1080/14786430902865518</a>.","ieee":"X.-D. Yang <i>et al.</i>, “Influence of magnetic fields on structural martensitic transitions,” <i>Philosophical Magazine</i>, vol. 89, no. 22–24. Taylor &#38; Francis, pp. 2083–2091, 2009.","apa":"Yang, X.-D., Riseborough, P. S., Modic, K. A., Fisher, R. A., Opeil, C. P., Finlayson, T. R., … Lashley, J. C. (2009). Influence of magnetic fields on structural martensitic transitions. <i>Philosophical Magazine</i>. Taylor &#38; Francis. <a href=\"https://doi.org/10.1080/14786430902865518\">https://doi.org/10.1080/14786430902865518</a>","ama":"Yang X-D, Riseborough PS, Modic KA, et al. Influence of magnetic fields on structural martensitic transitions. <i>Philosophical Magazine</i>. 2009;89(22-24):2083-2091. doi:<a href=\"https://doi.org/10.1080/14786430902865518\">10.1080/14786430902865518</a>"},"year":"2009","date_updated":"2023-02-21T16:26:53Z","abstract":[{"text":"We show evidence that a structural martensitic transition is related to significant changes in the electronic structure, as revealed in thermodynamic measurements made in high magnetic fields. The effect of the magnetic field is considered unusual as many influential investigations of martensitic transitions have emphasized that the structural transitions are primarily lattice dynamical and are driven by the entropy due to the phonons. We provide a theoretical framework, which can be used to describe the effect of the magnetic field on the lattice dynamics in which the field dependence originates from the dielectric constant.","lang":"eng"}],"publication_identifier":{"issn":["1478-6435"],"eissn":["1478-6443"]},"day":"21","doi":"10.1080/14786430902865518","status":"public","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","related_material":{"record":[{"status":"public","relation":"earlier_version","id":"11752"}]},"extern":"1","volume":89,"issue":"22-24","author":[{"first_name":"X.-D.","last_name":"Yang","full_name":"Yang, X.-D."},{"first_name":"P.S.","last_name":"Riseborough","full_name":"Riseborough, P.S."},{"orcid":"0000-0001-9760-3147","full_name":"Modic, Kimberly A","first_name":"Kimberly A","last_name":"Modic","id":"13C26AC0-EB69-11E9-87C6-5F3BE6697425"},{"first_name":"R.A.","last_name":"Fisher","full_name":"Fisher, R.A."},{"full_name":"Opeil, C.P.","first_name":"C.P.","last_name":"Opeil"},{"last_name":"Finlayson","first_name":"T.R.","full_name":"Finlayson, T.R."},{"first_name":"J.C.","last_name":"Cooley","full_name":"Cooley, J.C."},{"full_name":"Smith, J.L.","first_name":"J.L.","last_name":"Smith"},{"full_name":"Goddard, P.A.","last_name":"Goddard","first_name":"P.A."},{"first_name":"A.V.","last_name":"Silhanek","full_name":"Silhanek, A.V."},{"first_name":"J.C.","last_name":"Lashley","full_name":"Lashley, J.C."}],"_id":"7080","publication":"Philosophical Magazine","intvolume":"        89","title":"Influence of magnetic fields on structural martensitic transitions","month":"08","article_processing_charge":"No","date_created":"2019-11-19T13:48:32Z","publication_status":"published","oa_version":"None","language":[{"iso":"eng"}],"quality_controlled":"1","page":"2083-2091","article_type":"original","publisher":"Taylor & Francis"}]