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1 J. Appl. Phys. 105, 053908 (2009) Large magnetic refrigerant capacity in Gd71Fe3Al26 and Gd65Fe20Al15 amorphous alloys Q. Y. Dong, B. G. Shen, J. Chen, J. Shen, F. Wang, H. W. Zhang, and J. R. Sun State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China Magnetic entropy change and refrigerant capacity of Gd-based amorphous Gd71Fe3Al26 and Gd65Fe20Al15 alloys are investigated. The refrigerant capacities reach 750 and 726 J kg−1 for Gd71Fe3Al26 and Gd65Fe20Al15, respectively, which are much larger than those of all magnetocaloric materials ever reported. The peak values of magnetic entropy change under a field change of 0–5 T are 7.4 J kg−1 K−1 at 117.5 K and 5.8 J kg−1 K−1 at 182.5 K for Gd71Fe3Al26 and Gd65Fe20Al15, respectively. A very large refrigerant capacity and a considerable magnetic entropy change jointly make them attractive candidates for magnetic refrigerant. ©2009 American Institute of Physics 2 Scripta Materialia - Article in Press, Accepted Manuscript Nanoscale amorphization of severely deformed NiTi shape memory alloys M. Peterlechnera, T. Waitza and H.P. Karnthalera aPhysics of Nanostructured Materials, Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria Received 26 January 2009; revised 27 February 2009; accepted 28 February 2009. Available online 6 March 2009. Abstract NiTi shape memory alloys deformed by high pressure torsion (HTP) were investigated by transmission electron microscopy. Radial sections of the HPT discs facilitate the analysis of amorphous and crystalline phases arising at a nanoscale. Ultra thin amorphous ribbons forming at grain boundaries are intersected by shear bands. At higher deformation they transform into thicker amorphous bands containing nanocrystalline debris. In the case of planar sections, the presence of amorphous phase can be obscured by overlapping nanocrystals leading to moiré contrast. Keywords: amorphization; high pressure torsion (HPT); transmission electron microscopy (TEM); NiTi; shape memory alloys (SMA) 3 Scripta Materialia - Article in Press, Accepted Manuscript In-situ measurements of surface tension-driven shape recovery in a metallic glass Corinne E. Packarda, Jan Schroersb and Christopher A. Schuha aDepartment of Materials Science & Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA bDepartment of Mechanical Engineering, Yale University, New Haven, CT, USA Received 20 February 2009; revised 27 February 2009; accepted 28 February 2009. Available online 6 March 2009. Abstract A new technique, involving nanoindentation and in-situ scanning probe microscopy at high temperature under an inert atmosphere, is used to study deformation of a Pt-based metallic glass. As temperature is increased into the super-cooled liquid regime, impressions made by nanoindentation flatten due to surface tension-driven viscous flow. In-situ measurements of shape recovery at various temperatures and times permit an estimation of the apparent activation energy for Newtonian-viscous flow. Keywords: metallic glasses; nanoindentation; high temperature deformation; surface energy 4 Scripta Materialia - Article in Press, Accepted Manuscript Electron Irradiation Induced Structural Transformation in Metallic Glasses E.G. Fua, Jesse Carterb, Michael Martinb, Guoqiang Xiec, X. Zhanga, Y.Q. Wangd, Rick Littletone and Lin Shaob aDepartment of Mechanical Engineering, Texas A&M University, College Station, Texas 77843 bDepartment of Nuclear Engineering, Texas A&M University, College Station, Texas 77843 cInstitute for Materials Research, Tohoku University, Sendai 980-8577, Japan dLos Alamos National Laboratory, Los Alamos, New Mexico 87545 eThe Microscopy and Imaging Center, Texas A&M university, College Station, Texas 77843 Received 6 February 2009; revised 1 March 2009; accepted 1 March 2009. Available online 6 March 2009. Abstract Microstructural evolution of Zr55Cu30Al10Ni5 and Cu50Zr45Ti5 metallic glasses under 200 keV electron irradiation has been studied in situ by transmission electron microscopy. Zr55Cu30Al10Ni5, which has a wider supercooled liquid region, is found to be stable under electron irradiation and no crystallization is observed up to an irradiation fluence of 8.7×1026electrons/m2. In contrast, nanometer size crystalline Cu10Zr7 phases are formed in Cu50Zr45Ti5under electron irradiation. The partial crystallization is attributed to irradiation enhanced atom mobility. Keywords: Metallic glasses; Recrystallization [ Last edited by hslining on 2009-9-10 at 16:35 ] |
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