scholarly journals X-Ray Study of Rolled Single Crystals of Ti–48%Ni–2%Fe Alloy. Part I: Texture Development and Mechanisms of Plastic Deformation

1998 ◽  
Vol 31 (1-2) ◽  
pp. 53-84 ◽  
Author(s):  
Yu. Perlovich ◽  
H. J. Bunge ◽  
M. Isaenkova ◽  
V. Fesenko ◽  
R. Rustamov
Keyword(s):  
Plastic Deformation ◽  
Single Crystals ◽  
Texture Development ◽  
X Ray ◽  
Combined Action ◽  
Alloy Part ◽  
First Time ◽  
Mechanisms Of Plastic Deformation

Rolled single crystals of the alloy Ti–48%Ni–2%Fe were studied by methods of X-ray diffractometry using a PSD-technique. Single crystals, consisting of the phase B2, were rolled in 11 initial orientations at 350°C with deformation degrees up to ~80%. Texture development in single crystals under rolling was analyzed to determine the acting mechanisms of plastic deformation. Three stable orientations of single crystals were found: {011}〈011〉 ,{111}〈011〉 and {111}〈112〉. It was shown on the basis of texture data, that Ti–Ni single crystals deform by means of combined action of slip in the systems {011}〈001〉 and twinning. For the first time, along with twinning in the known systems {114}〈221〉 , twinning in the systems {118}〈441〉 was revealed. A number of concrete cases was considered to refine the contributions of slip and twinning into reorientation of single crystals depending on their initial orientations as well as to ascertain the interrelation of different mechanisms.

Variants of Texture Formation by Rolling of Ti-Ni Single Crystals with Shape Memory Properties

2011 ◽  
Vol 702-703 ◽  
pp. 900-903
Author(s):  
Margarita Isaenkova ◽  
Yuriy Perlovich ◽  
Vladimir Fesenko ◽  
Tatyana Dementyeva ◽  
Vladimir Goltcev
Keyword(s):  
Plastic Deformation ◽  
Shape Memory ◽  
Single Crystals ◽  
Rolling Texture ◽  
Texture Development ◽  
Texture Formation ◽  
Shape Memory Properties ◽  
Combined Action

Single crystals of the alloy Ti-48%Ni-2%Fe, consisting of the phase B2, were rolled at 350°C with deformation degrees up to ~80% in 11 different initial orientations. Texture development in single crystals under rolling was analyzed to determine the active mechanisms of their plastic deformation. There are three stable initial orientations, which remain unchanged during rolling of Ti-Ni single crystals: {011}<011>, {111}<011> and {111}<112>. It was shown, that Ti-Ni single crystals deform by means of combined action of slip in systems {011}<001> and twinning in systems {114}<221> and {118}<441>. Variants of rolling texture formation in single crystals are very diverse and depend on their initial orientations and deformation degrees.

Refinement of the layered titanosilicate AM-1 from single-crystal X-ray diffraction data

2007 ◽  
Vol 63 (11) ◽  
pp. i186-i186 ◽  
Author(s):  
Stanislav Ferdov ◽  
Uwe Kolitsch ◽  
Christian Lengauer ◽  
Ekkehart Tillmanns ◽  
Zhi Lin ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Hydrogen Bonding ◽  
Single Crystal ◽  
Single Crystals ◽  
Diffraction Data ◽  
X Ray Diffraction ◽  
X Ray ◽  
First Time ◽  
Ir And Raman ◽  
Bonding Scheme

The structure of the layered noncentrosymmetric titanosilicate AM-1 (also known as JDF-L1, disodium titanium tetrasilicate dihydrate), Na4Ti2Si8O22·4H2O, grown as small single crystals without the use of organics, has been refined from single-crystal X-ray diffraction data. The H atom has been located for the first time, and the hydrogen-bonding scheme is also characterized by IR and Raman spectroscopy. All atoms are in general positions except for the Na, the Ti, one Ti-bound O, one Si-bound O and the water O atoms (site symmetries 2, 4, 4, 2 and 2, respectively).

Plastic Deformation of Approximants: Dislocations vs. Phason Lines

1998 ◽  
Vol 553 ◽  
Author(s):  
H. Klein ◽  
M. Feuerbacher ◽  
P. Schall ◽  
K. Urban
Keyword(s):  
Plastic Deformation ◽  
High Temperature ◽  
Single Crystals ◽  
Periodic Lattice ◽  
Length Scale ◽  
Relative Importance ◽  
Line Lattice ◽  
Burgers Vector ◽  
Mechanisms Of Plastic Deformation

AbstractDeformation experiments were performed on single crystals of the ξ-AIPdMn approximant in bending geometry at high temperature. Two different mechanisms of plastic deformation are shown to exist in this phase: one based on dislocations and another novel mechanism based on the motion of phason lines. Burgers vector and line directions of dislocations were determined. Phason lines are shown to build a periodic lattice. The interaction of a dislocation with the phason line lattice results in dislocations on another length scale. This meta-dislocation in the periodic phason line lattice has a Burgers vector of magnitude 165 Å. The relative importance of phason lines and dislocations for the plastic deformation is discussed as a function of the orientation of the sample with respect to the bending geometry.

scholarly journals Hard X-ray magnetochiral dichroism in a paramagnetic molecular 4f complex

2020 ◽  
Vol 11 (31) ◽  
pp. 8306-8311
Author(s):  
Dmitri Mitcov ◽  
Mikhail Platunov ◽  
Christian D. Buch ◽  
Anders Reinholdt ◽  
Anders R. Døssing ◽  
...  
Keyword(s):  
Single Crystals ◽  
Opposite Sign ◽  
X Ray ◽  
First Time ◽  
X Ray Absorption ◽  
Absorption Measurements

Magnetochiral Dichroism of chiral mononuclear lanthanoid complexes is for the first time detected by X-ray absorption measurements on single crystals of Holmium oxydiacetate, at the Ho L3-edge. The effect is of opposite sign for the two enantiomers.

Condensed [Ru4Sn6] Units in the Stannides LnRu4Sn6 (Ln = La, Pr, Nd, Sm, Gd) - Synthesis, Structure, and Chemical Bonding

1999 ◽  
Vol 54 (7) ◽  
pp. 863-869 ◽  
Author(s):  
Markus F. Zumdick ◽  
Rainer Pöttgen
Keyword(s):  
Rare Earth ◽  
Single Crystals ◽  
Chemical Bonding ◽  
Melting Furnace ◽  
Structural Motif ◽  
X Ray Diffraction ◽  
X Ray ◽  
Arc Melting ◽  
First Time ◽  
Gadolinium Compound

The stannides LnRu4Sn6 (Ln = La, Pr, Nd, Sm, Gd) were prepared by reaction of the elements in an arc-melting furnace and subsequent annealing at 1120 K. The praseodymium, the neodymium, and the samarium stannide were obtained for the first time. The LnRu4Sn6 stannides were investigated by X-ray diffraction both on powders and single crystals. They adopt the YRu4Sn6 type structure which was refined from single crystal X-ray data for the samarium and the gadolinium compound: I4̄2m, a = 686.1 (1), c = 977.7(2) pm, wR2 = 0.0649, 483 F2 values for SmRu4Sn6, and a = 685.2(1), c = 977.6(3) pm, wR2 = 0.0629, 554 F2 values for GdRu4Sn6 with 19 variables for each refinement. The striking structural motif of these stannides are distorted RuSn6 octahedra with Ru-Sn distances ranging from 257 to 278 pm. Four of such octahedra are condensed via common edges and faces forming [Ru4Sn6] units which are packed in a tetragonal body-centered arrangement. The rare-earth atoms fill the voids between the [Ru4Sn6] units. Based on an extended Hückel calculation, strong bonding interactions were found for the Ru-Sn and the various Sn-Sn contacts.

Plastic deformation of selenium single crystals ina glide and X-ray observation of the induced substructure

1976 ◽  
Vol 36 (2) ◽  
pp. 461-470 ◽  
Author(s):  
J. L. Farvacque ◽  
J. C. Doukhan ◽  
B. Escaig ◽  
T. Tuomi
Keyword(s):  
Plastic Deformation ◽  
Single Crystals ◽  
X Ray

Thermally activated mechanisms of plastic deformation of single crystals of the disordered alloy Ni3Fe

1978 ◽  
Vol 21 (7) ◽  
pp. 929-932
Author(s):  
V. V. Starenchenko ◽  
V. S. Kobytev ◽  
�. V. Kozlov ◽  
L. E. Popov
Keyword(s):  
Plastic Deformation ◽  
Single Crystals ◽  
Thermally Activated ◽  
Alloy Ni3fe ◽  
Mechanisms Of Plastic Deformation ◽  
Disordered Alloy

Ionic Conductivity of Li2ZnTi3O8 Single Crystal

2011 ◽  
Vol 497 ◽  
pp. 26-30 ◽  
Author(s):  
Shinichi Furusawa ◽  
Hiroshi Ochiai ◽  
Khoji Murayama
Keyword(s):  
Ionic Conductivity ◽  
Single Crystal ◽  
Temperature Dependence ◽  
Single Crystals ◽  
Powder Diffraction ◽  
Floating Zone ◽  
Zinc Titanate ◽  
X Ray ◽  
Temperature Range ◽  
First Time

Single crystals of lithium zinc titanate (Li2ZnTi3O8) were grown in a double-mirror type optical floating-zone furnace for the first time. Single crystals were characterized by X-ray powder diffraction and Laue measurements. The ionic conductivity of the single crystals was measured in the temperature range of 400–700 K. Below 600 K, the ionic conductivity of the single crystal is one to two orders of magnitude higher than that of polycrystalline Li2ZnTi3O8. In the temperature range of 550–600 K, the temperature dependence of the ionic conductivity shows non-Arrhenius behaviour.

Azide und Cyanamide – ähnlich und doch anders/Azides and Cyanamides – Similar and Yet Different

2003 ◽  
Vol 58 (11) ◽  
pp. 1097-1104 ◽  
Author(s):  
Olaf Reckeweg ◽  
Arndt Simon
Keyword(s):  
Ir Spectroscopy ◽  
Single Crystals ◽  
Crystal Structures ◽  
Spectroscopic Data ◽  
Structural Features ◽  
X Ray Diffraction ◽  
X Ray ◽  
First Time ◽  
Raman And Ir Spectroscopy

Abstract The crystal structures of LiN3*H2O (P63/mcm (No. 193), Z = 6; 924.01(13); 560.06(7) pm); NH4N3 (Pmna (No. 53), Z =4; a=889.78(18), b=380,67(8), c=867.35(17) pm); Ca(N3)2 (Fddd (No. 70), Z = 8; a=595.4(2), b=1103.6(5), c=1133.1(6) pm), Sr(N3)2 (Fddd (No. 70), Z =8; a= 612.02(9), b = 1154.60(18), c = 1182.62(15) pm); Ba(N3)2 (P21/m (No. 11), Z = 2; a = 544.8(1), b = 439.9(1), c = 961.3(2) pm, β = 99.64(3)°) and TlN3 (I4/mcm (No. 140), Z = 2; 618.96(9); 732.71(15) pm) have been either determined for the first time or redetermined by X-ray diffraction on single crystals. The afore mentioned compounds, AN3 (A = Na, K, Rb, Cs), M(N3)2 · 2.5 H2O (M = Mg, Zn) and the cyanamides Li2CN2, CdCN2 and CuCN2 were investigated by Raman and IR spectroscopy (KBr technique). Structural features and spectroscopic data of azides and cyanamides from this work and from literature are listed and compared.

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