Berlin 2012 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MM: Fachverband Metall- und Materialphysik
MM 58: Topical Session Modern Atom Probe Tomography VI - Ordering, Clustering and Segregation
MM 58.2: Vortrag
Donnerstag, 29. März 2012, 17:15–17:30, H 0107
Short range order and its correlation with anti phase boundaries in Ni2(Cr0.5,Mo0.5) alloy — Amit Verma1,2, •Nelia Wanderka1, Nikolai Lazarev3, J.B. Singh2, and M. Sundararaman4 — 1Helmholtz Zentrum Berlin, Berlin, Germany — 2Mechanical Metallurgy Division, Bhabha Atomic Research Centre, Mumbai, India — 3NSC Kharkov Institute of Physics and Technology, Kharkov, Ukraine — 4Hyderabad Central University, India
Nickel base Ni2M (M = Cr, Mo, V, W) alloys belong to {1 1/2 0} family of alloys which undergo disorder to order transformation via a short-range order (SRO) state. In the present work, SRO to LRO transformation has been investigated in the alloy with solution treated initial microstructure. The ordering sequence has been studied using resistivity measurements and the change in resistance is correlated with microstructure. Atom probe (3D-AP) investigations revealed the presence of composition fluctuations of N2M2, N3M, N4M type (where N represents Ni atom and M represents Cr and Mo atoms). Transmission electron microscopy investigations carried out on fully ordered samples revealed the presence of anti-phase boundaries (APBs) which contained N2M2 type compositional clusters as established by TAP investigations. The appearance of the SRO state during the dissolution of the LRO could thus be attributed to the N2M2 clusters at APBs as revealed by resistivity investigation.