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This effect is known to originate from the behaviour of the screw dislocations; however, the underlying physics has so far remained insufficiently understood to predict plastic anisotropy without adjustable parameters. Here we show that deviations from the Schmid law can be quantified from the deviations of the screw dislocation trajectory away from a straight path between equilibrium configurations, a consequence of the asymmetrical and metal-dependent potential energy landscape of the dislocation. We propose a modified parameter-free Schmid law, based on a projection of the applied stress on the curved trajectory, which compares well with experimental variations and first-principles calculations of the dislocation Peierls stress as a function of crystal orientation.<\/jats:p>","DOI":"10.1038\/ncomms11695","type":"journal-article","created":{"date-parts":[[2016,5,25]],"date-time":"2016-05-25T10:49:35Z","timestamp":1464173375000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":166,"title":["Plastic anisotropy and dislocation trajectory in BCC metals"],"prefix":"10.1038","volume":"7","author":[{"given":"Lucile","family":"Dezerald","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"David","family":"Rodney","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0995-6071","authenticated-orcid":false,"given":"Emmanuel","family":"Clouet","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lisa","family":"Ventelon","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fran\u00e7ois","family":"Willaime","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2016,5,25]]},"reference":[{"key":"BFncomms11695_CR1","unstructured":"Schmid, E. in Proceedings of the First International Congress of Applied Mechanics eds Biezeno C., Bergers J. 342\u2013353Delft (1924)."},{"key":"BFncomms11695_CR2","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1098\/rspa.1928.0032","volume":"118","author":"GI Taylor","year":"1928","unstructured":"Taylor, G. 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