Search Results

You are looking at 1 - 10 of 32 items for :

  • anelasticity x
Clear All
Open access

M.R. Silva, L.B.S. Silva, D. Rodrigues Junior and C.R. Grandini

References [1] J. Nagamatsu, N. Nakagawa, T. Muranaka, Y. Zenitani, J. Akimitsu, Superconductivity at 39 K in magnesium diboride, Nature 410, 63-64 (2001). [2] A.S. Nowick, B.S. Berry, Anelastic Relaxation in Crystalline Solids, Academic Press, New York, 1972. [3] R. De Batist, Internal Friction of Structural Defects in Crystalline Solids, North-Holland, Amsterdam, 1972. [4] L.B. Magalas, Mechanical spectroscopy - Fundamentals, Sol. St. Phen. 89, 1-22 (2003). [5] S. Etienne, S

Open access

J.R.S. Martins, R.O. Araújo, R.A. Nogueira and C.R. Grandini

Alloys ASM International, Ohio, 1989. [5] G. Lütjering, J.C. Williams, Titanium, 2nd Ed., Spinger, Berlin, 2007. [6] A.S. Nowick, B.S. Berry, Anelastic Relaxation in Crystalline Solids, Academic Press, New York, 1972. [7] R. De Batist, Internal Friction of Structural Defects in Crystalline Solids, North-Holland, Amsterdam, 1972. [8] T.S. Kê, Internal Friction Theory in Solids, Science Press, Beijing, 2000. [9] A. Puskar, Internal Friction of Materials, Cambridge International Science

Open access

F. Cordero, F. Craciun, F. Trequattrini and C. Galassi

Abstract

The transition from the rhombohedral-ferroelectric to the lower temperature orthorhombic-antiferroelectric phase in Zr-rich PZT involves two order parameters (OPs): 1) the polar OP for the displacements of the cations with respect to the O octahedra; 2) an antiferrodistortive OP responsible for tilting of the octahedra. It is shown that at Ti compositions near the morphotropic boundary with the FE phase (0.046 ≤ x ≤ 0.054), the two OPs may be almost independent of each other at cooling rates of 0.5 K/min or faster, depending on the sample history. This fact gives rise to a great variety of shapes of the curves of the elastic compliance s(T), but all of them can be fitted very well as superpositions of variously broadened steps for each of the modes involved in the transitions, including the tilt transition occurring in the untransformed FE fraction. The evolution of the s(T) curves includes enhancements up to a factor of four during aging for weeks in the region of the AFE/FE coexistence. Restiffening and reduction of the thermal hysteresis of the AFE/FE transition are recovered by heating up to 800-900 K. It is proposed that ageing is due to the clustering of relatively mobile defects, most likely O vacancies, at the domain walls in the coexisting AFE/FE phases. Such defect structures are probably at the origin of intense thermally activated relaxation processes observed above TC in the dielectric and anelastic spectra, and can be annealed out above 800 K, allowing the AFE transition to recover a fast kinetics.

Open access

P.S. Silva, J.C.C.A. Diaz, O. Florêncio, M. Venet and J.C. M’Peko

, 3729-3740 (2012). [9] O. Florencio, P.S. da Silva, J.A. Eiras, D. Garcia, E.R. Botero, Study of the Anelastic Behavior of PZT and PLZT Ferroelectric Ceramics, Defect and Diffusion Forum 326-328, 719-724 (2012). [10] P.S. Silva Jr., O. Florêncio, E.R. Botero, J.A. Eiras, D. Garcia, Phase transition study in PLZT ferroelectric ceramics by mechanical and dielectric spectroscopies, Materials Science and Engineering. A, Structural Materials: properties, microstructure and processing, 521-522, 224-227 (2009). [11] A.S. Nowick

Open access

M.L. Lei, L. Chen and X.M. Xiong

References [1] P.G. de Gennes, Soft matter (Nobel lecture). Angewandte Chemie, International Edition in English 31(7) 842-845 (1992). [2] A.S. Nowick, B.S. Berry, Anelastic Relaxation in Crystalline Solids, Academic Press, 1972. [3] L.B. Magalas, Mechanical spectroscopy - Fundamentals, Sol. St. Phen. 89, 1-22 (2003). [4] S. Etienne, S. Elkoun, L. David, L.B. Magalas, Mechanical spectroscopy and other relaxation spectroscopies, Sol. St. Phen. 89, 31-66 (2003). [5] T.S. Kê

Open access

W.B. Jiang, Q.P. Kong, L.B. Magalas and Q.F. Fang

internal friction of pure Mg processed by ECAP, Mater. Sci. Eng. A 566 , 588-594 (2012). [12] C. Esnouf, G. Fantozzi, Medium temperature internal friciton in high purity f.c.c. and h.c.p metals, J. Phys. C5 , 445-450 (1981). [13] M.L. Nó, A. Oleaga, C. Esnouf, J. San Juan, Internal friction at medium temperatures in high purity magnesium, Phys. Stat. Sol. (a) 120 , 419-427 (1990). [14] Z. Trojanov, B. Weidenfeller, P. Lukae, W. Riehemann, M. Stank, Anelastic properties of nanocrystalline magnesium, in: M.J. Zehetbauer, R.Z. Valiev (Eds.) Nanomaterials by se

Open access

A.-K. Maier, D. Mari, I. Tkalcec and R. Schaller

.P. Kong, W.B. Jiang, M. Winning, Internal friction peak in bicrystals with different misorientations, Phys. Rev. B 71 , 6, 060101(R) (2005). [9] S. Plimpton, http://lammps.sandia.gov, official lammps website, 1995. [10] G. Grochola, S.P. Russo, I.K. Snook, On fitting a gold embed-ded atom method potential using the force matching method, J. Chem. Phys. 123 , 20, 204719 (2005). [11] A.-K. Maier, D. Mari, I. Tkalcec, R. Schaller. Theoretical mod-elling of grain boundary anelastic relaxations, Acta Mater. 74 , 132-140 (2014). [12] A.-K. Maier, I. Tkalcec, D

Open access

H. Numakura

REFERENCES [1] W.C. Leslie, The Physical Metallurgy of Steels, Hemisphere Pub., New York, 1981, Chapter 4. [2] W.B. Hutchinson, K. Ushioda, Texture development in continuous annealing, Scand. J. Metall. 13 , 269-275 (1984). [3] J. Takahashi, N. Maruyama, K. Kawakami, N. Yoshinaga, M. Sugiyama, T. Ohkubo, D. Ping, K. Hono, Atom probe analysis on interaction between Cr and N in bake-hardening steels with anti-aging properties at RT, Mat. Sci. Eng. A 585 , 100-107 (2013). [4] A.S. Nowick, B.S. Berry, Anelastic Relaxation in Crystalline

Open access

R. Zachariasz, J.A. Bartkowska, D. Bochenek and P. Niemiec

-183 (2007). [4] B.L. Chen g, M. Gabbay, M. Maglione, G. Fan- tozzi, Relaxation motion and possible memory of domain structures in barium titanate ceramics studied by mechanical and dielectric losses, J. Electroceramics 10, 5-18 (2003). [5] R. Zachariasz, D. Bochenek, Low frequency elastic and anelastic properties of Pb(Fe- Nbx)O3 ferroelectric ceramics, The European Physical Journal Special Topics 154, 253-256 (2008). [6] D. Bochenek, R. Zachariasz, PFNceramics synthesized byatwo-stage method, Archives of Metallurgy and

Open access

B. Zhang, H. Wagner, M. Büchsenschütz-Göbeler, Y. Luo, S. Küchemann, W. Arnold and K. Samwer

-236 (1998). [13] F. H. Stillinger, T.A. Weber, Hidden structure in liquids, Phys. Rev. A 25, 978-989 (1982); F. H. Stillinger, A topographic view of supercooled liquids and glass-formation, Science 31, 1935-1939 (1995). [14] J.S. Harmon, M.D. Demetriou, W.L. Johnson, K. Samwer, Anelastic to plastic transition in metallic glass-forming liquids, Phys. Rev. Lett. 99, 135502 (2007). [15] W.L. Johnson, K. Samwer, A universal criterion for plastic yielding of metallic glasses with a (T/Tg)2/3 temperature dependence, Phys. Rev