Generalized stacking fault energies of alloys
W. Li; S. Lu; Q. M. Hu; S. K. Kwon; B. Johansson; L. Vitos
Source PublicationJournal of Physics-Condensed Matter
AbstractThe generalized stacking fault energy (gamma surface) provides fundamental physics for understanding the plastic deformation mechanisms. Using the ab initio exact muffin-tin orbitals method in combination with the coherent potential approximation, we calculate the. surface for the disordered Cu-Al, Cu-Zn, Cu-Ga, Cu-Ni, Pd-Ag and Pd-Au alloys. Studying the effect of segregation of the solute to the stacking fault planes shows that only the local chemical composition affects the. surface. The calculated alloying trends are discussed using the electronic band structure of the base and distorted alloys. Based on our. surface results, we demonstrate that the previous revealed 'universal scaling law' between the intrinsic energy barriers (IEBs) is well obeyed in random solid solutions. This greatly simplifies the calculations of the twinning measure parameters or the critical twinning stress. Adopting two twinnability measure parameters derived from the IEBs, we find that in binary Cu alloys, Al, Zn and Ga increase the twinnability, while Ni decreases it. Aluminum and gallium yield similar effects on the twinnability.
description.department[li, wei ; lu, song ; johansson, boerje ; vitos, levente] royal inst technol, dept mat sci & engn, se-10044 stockholm, sweden. [hu, qing-miao] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [kwon, se kyun] pohang univ sci & technol, grad inst ferrous technol, pohang 790784, south korea. [johansson, boerje ; vitos, levente] uppsala univ, div mat theory, dept phys & astron, se-751210 uppsala, sweden. [vitos, levente] inst solid state phys & opt, wigner res ctr phys, h-1525 budapest, hungary. ; li, w (reprint author), royal inst technol, dept mat sci & engn, se-10044 stockholm, sweden. ; ;
KeywordStacking Fault Energy Random Alloy Ab Initio Molecular-dynamics Simulation Austenitic Stainless-steels Close-packed Metals Nanocrystalline Aluminum Plastic-deformation Fcc Metals Copper Approximation Temperature Nucleation
Document Type期刊论文
Recommended Citation
GB/T 7714
W. Li,S. Lu,Q. M. Hu,et al. Generalized stacking fault energies of alloys[J]. Journal of Physics-Condensed Matter,2014,26(26).
APA W. Li,S. Lu,Q. M. Hu,S. K. Kwon,B. Johansson,&L. Vitos.(2014).Generalized stacking fault energies of alloys.Journal of Physics-Condensed Matter,26(26).
MLA W. Li,et al."Generalized stacking fault energies of alloys".Journal of Physics-Condensed Matter 26.26(2014).
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