Grain size and alloying effects on dynamic recovery in nanocrystalline metals. (15th October 2016)

• Record Type: Journal Article
• Authors: Sun, Z.; Van Petegem, S.; Cervellino, A.; Blum, W.; Van Swygenhoven, H.
• Is Part Of: Acta materialia. Volume 119(2016)
• Page Start: 104
• Page End: 114
• Publication Date: 2016-10-15
• Subjects: Nanocrystalline metals -- Stress reduction -- In situ X-ray diffraction -- Dynamic recovery; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2016.08.019
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: Dynamic recovery in nanocrystalline Ni and Ni50 Fe50 with respective grain sizes of 65 nm and 15 nm is studied using stress reduction tests during in situ X-ray diffraction. The results are compared with a previous study on NC Ni with 35 nm grain size. Defect recovery by means of grain boundary processes plays an important role in controlling the strength evolution resulting in a constant flow stress during uniaxial deformation. The relative contributions of dislocation and grain boundary accommodation mechanisms are discussed in terms of grain size and alloying. Graphical abstract: