Anisotropy in Cold Rolling of Single Crystalline Ni<sub>3</sub>-Al-Base Intermetallic Alloys

AbstractNumerous studies have shown that equiaxed ultra fine grained FePd alloys can be produced by phase transformation of heavily deformed austenitic FePd via the combined reaction mode. As the magnetic properties can be improved by suppression of the polytwinned micro-constituent formed by the conventional ordering mode it appears reasonable to speculate that further grain refinement might lead to further enhancement. In order to reduce the grain size in bulk intermetallic alloys severely plastically deformed austenitic FePd has been phase transformed in this study. Equal channel angular pressing (ECAP) has been used to deform disordered FePd. The microstructure and property evolution during the deformation process and post-deformation annealing have been studied using SEM, TEM and hardness and magnetization curve measurements. The observations are compared to known results from use of other deformation processing routes, such as cold rolling.

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Characterization of Dislocations in Single-Crystalline Ag3Sn Intermetallic Alloys

Microscopy and Microanalysis ◽

10.1017/s1431927617004469 ◽

2017 ◽

Vol 23 (S1) ◽

pp. 760-761

Author(s):

H. Yu ◽

Y. Sun ◽

S-W. Lee ◽

P.C. Canfield ◽

M. Aindow

Keyword(s):

Intermetallic Alloys ◽

Single Crystalline

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Anisotropy in Cold Rolling of Single Crystalline Ni3-Al-Base Intermetallic Alloys

Materials Science Forum ◽

10.4028/www.scientific.net/msf.495-497.737 ◽

2005 ◽

Vol 495-497 ◽

pp. 737-742 ◽

Cited By ~ 2

Author(s):

Kyosuke Kishida ◽

Masahiko Demura ◽

Toshiyuki Hirano

Keyword(s):

Cold Rolling ◽

Single Crystals ◽

Microstructure Evolution ◽

Rolling Direction ◽

Stacking Faults ◽

Intermetallic Alloys ◽

Shear Deformations ◽

Planar Defects ◽

Crystal Orientations ◽

Initial Crystal

Texture and microstructure evolution during cold rolling of binary Ni3Al single crystals were studied as a function of the initial crystal orientations. Cold rolling behavior of the single crystals is strongly dependent on the initial crystal orientations, especially on the initial rolling direction (RD). Macroscopic texture evolutions for binary Ni3Al single crystals with the initial RD close to <001> are characterized as development of dual {110}<¯112> texture above 90% cold reduction and the banded structure formation. Microstructure observations reveal the extensive formation and accumulation of the planar defects including the stacking faults and the planes where the localized shear deformations occurs, which must be responsible for the observed anisotropic cold rolling behavior of Ni3Al single crystals.

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Cold Rolling Texture of Ni-Based L12 Ordered Intermetallic Alloys

MATERIALS TRANSACTIONS ◽

10.2320/matertrans.47.1485 ◽

2006 ◽

Vol 47 (6) ◽

pp. 1485-1491 ◽

Cited By ~ 4

Author(s):

Yasuyuki Kaneno ◽

Akira Takahashi ◽

Takayuki Takasugi

Keyword(s):

Cold Rolling ◽

Rolling Texture ◽

Intermetallic Alloys ◽

Ordered Intermetallic ◽

Cold Rolling Texture

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Effect of Microstructure on Cold Workability of Ni3Si base Multi-Phase Intermetallic Alloys

MRS Proceedings ◽

10.1557/opl.2011.302 ◽

2011 ◽

Vol 1295 ◽

Author(s):

Yasuyuki Kaneno ◽

Yasuyuki Matsuoka ◽

Takayuki Takasugi

Keyword(s):

Tensile Strength ◽

Cold Rolling ◽

Tensile Properties ◽

Rolled Plate ◽

Intermetallic Alloys ◽

Fine Grained ◽

Phase Intermetallic ◽

Multi Phase ◽

Cold Workability ◽

Effect Of Microstructure

ABSTRACTThe effect of microstructure on cold-rolling workability and tensile properties of Ni3Si (L12)−Ni3Ti (D024)−Ni3Nb (D0a) multi-phase intermetallic alloys was investigated. The cast alloys with different microstructures containing the D024 phase and/or the D0a phase particles in the L12 matrix were homogenized and then cold rolled. For the alloys with the microstructure consisting of coarse plate-like D024 particles in the L12 matrix, serious cracks initiated at the coarse D024 particles in the early stage of the cold rolling process and then propagated, resulting in failure of the rolled plate. On the contrary, for the alloys with the microstructure consisting of fine needle-like D024 precipitates and/or granular-shaped D0a particles, these second phase particles did not spoil the cold workability, leading to successful cold rolling to 90 % reduction. After 90 % cold rolling, the rolled sheets were fully recrystallized at 1173 K for 1 h, resulting in the formation of a fine-grained microstructure. The room-temperature tensile strength and the yield stress of the recrystallized sheet were remarkably enhanced compared with that of the unrolled alloys, possibly due to the fine-grained microstructure as well as the particle hardening. Also, the high-temperature tensile strength and the elongation were improved in the recrystallized sheets compared to an L12 single-phase Ni3(Si,Ti) alloy sheet. Consequently, it was found that the cold rolling and annealing process was beneficial to improve the tensile properties for the present multi-phase intermetallic alloys.

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Tensile Property of Cold-Rolled Foils of Ni-Based and Co-Based L12 Intermetallic Alloys

MRS Proceedings ◽

10.1557/proc-980-0980-ii05-25 ◽

2006 ◽

Vol 980 ◽

Cited By ~ 1

Author(s):

Yasuyuki Kaneno ◽

Takayuki Takasugi ◽

Tadamichi Myoki

Keyword(s):

Tensile Strength ◽

Cold Rolling ◽

Room Temperature ◽

Annealing Temperature ◽

Tensile Elongation ◽

Intermetallic Alloys ◽

High Tensile Strength ◽

Thermomechanical Process ◽

Thin Foils ◽

Cold Rolled

AbstractPolycrystalline L12-type Ni3(Si,Ti), Co3Ti and Ni3Al alloys prepared through the thermomechanical process from arc-melted ingots were successfully cold-rolled to thin foils with a thickness of below 200μm. The cold-rolling with over 90% reduction in thickness was possible without providing intermediate annealing. The cold-rolled foils showed high tensile strength (~2GPa) at room temperature due to heavily cold rolling although no plastic elongation was observed. Room temperature tensile elongation increased with increasing annealing temperature, and reached to ~30-40% by high temperature annealing at 1173K. Among three kinds of intermetallic alloys, the Ni3(Si,Ti) foil annealed around at 900K exhibited an extremely high tensile strength and yield strength (over 2GPa) with a reasonable tensile elongation. The observed tensile properties, especially tensile strength at low temperature for the present intermetallic foils were found to be superior to those for the conventional alloys such as nickel based alloys and stainless steels.

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“Preparation of Single Crystalline Gold Films for ED Studies”

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100096424 ◽

1972 ◽

Vol 30 ◽

pp. 634-635

Author(s):

Joseph D. C. Peng

Keyword(s):

Crystal Morphology ◽

Diffraction Theory ◽

Scattering Matrix ◽

Vacuum Evaporation ◽

Gold Films ◽

Matrix Formulation ◽

Silver Films ◽

Single Crystalline ◽

Grating Pattern ◽

Stacking Disorder

The relative intensities of the ED spots in a cross-grating pattern can be calculated using N-beam electron diffraction theory. The scattering matrix formulation of N-beam ED theory has been previously applied to imperfect microcrystals of gold containing stacking disorder (coherent twinning) in the (111) crystal plane. In the present experiment an effort has been made to grow single-crystalline, defect-free (111) gold films of a uniform and accurately know thickness using vacuum evaporation techniques. These represent stringent conditions to be met experimentally; however, if a meaningful comparison is to be made between theory and experiment, these factors must be carefully controlled. It is well-known that crystal morphology, perfection, and orientation each have pronounced effects on relative intensities in single crystals.The double evaporation method first suggested by Pashley was employed with some modifications. Oriented silver films of a thickness of about 1500Å were first grown by vacuum evaporation on freshly cleaved mica, with the substrate temperature at 285° C during evaporation with the deposition rate at 500-800Å/sec.

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Microanalytical Identification of a New Zr-Nb-Fe Phase

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100134259 ◽

1990 ◽

Vol 48 (2) ◽

pp. 132-133

Author(s):

O.T. Woo ◽

G.J.C. Carpenter

Keyword(s):

Trace Elements ◽

Cold Rolling ◽

Proportionality Factor ◽

Tube Material ◽

X Ray ◽

Metal Foils ◽

Arc Melting ◽

Intermetallic Particles ◽

Intermetallic Precipitates ◽

Cold Worked

To study the influence of trace elements on the corrosion and hydrogen ingress in Zr-2.5 Nb pressure tube material, buttons of this alloy containing up to 0.83 at% Fe were made by arc-melting. The buttons were then annealed at 973 K for three days, furnace cooled, followed by ≈80% cold-rolling. The microstructure of cold-worked Zr-2.5 at% Nb-0.83 at% Fe (Fig. 1) contained both β-Zr and intermetallic precipitates in the α-Zr grains. The particles were 0.1 to 0.7 μm in size, with shapes ranging from spherical to ellipsoidal and often contained faults. β-Zr appeared either roughly spherical or as irregular elongated patches, often extending to several micrometres.The composition of the intermetallic particles seen in Fig. 1 was determined using Van Cappellen’s extrapolation technique for energy dispersive X-ray analysis of thin metal foils. The method was employed to avoid corrections for absorption and fluorescence via the Cliff-Lorimer equation: CA/CB = kAB · IA/IB, where CA and CB are the concentrations by weight of the elements A and B, and IA and IB are the X-ray intensities; kAB is a proportionality factor.

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TEM study of amorphization of Cu and Ti foils by cold-rolling

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100173868 ◽

1990 ◽

Vol 48 (4) ◽

pp. 146-147

Author(s):

W. A. Chiou ◽

N. L. Jeon ◽

Genbao Xu ◽

M. Meshii

Keyword(s):

Solid State ◽

Cold Rolling ◽

High Energy ◽

Rapid Quenching ◽

Vapor Condensation ◽

Metallic Alloys ◽

Solid State Reactions ◽

High Energy Particle ◽

Amorphous Metallic Alloys ◽

Thin Foils

For many years amorphous metallic alloys have been prepared by rapid quenching techniques such as vapor condensation or melt quenching. Recently, solid-state reactions have shown to be an alternative for synthesizing amorphous metallic alloys. While solid-state amorphization by ball milling and high energy particle irradiation have been investigated extensively, the growth of amorphous phase by cold-rolling has been limited. This paper presents a morphological and structural study of amorphization of Cu and Ti foils by rolling.Samples of high purity Cu (99.999%) and Ti (99.99%) foils with a thickness of 0.025 mm were used as starting materials. These thin foils were cut to 5 cm (w) × 10 cm (1), and the surface was cleaned with acetone. A total of twenty alternatively stacked Cu and Ti foils were then rolled. Composite layers following each rolling pass were cleaned with acetone, cut into half and stacked together, and then rolled again.

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The microstructure of a TiB2/Ti-47 Al composite material

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100155347 ◽

1989 ◽

Vol 47 ◽

pp. 674-675

Author(s):

O. Popoola ◽

A.H. Heuer ◽

P. Pirouz

Keyword(s):

Composite Material ◽

Ion Beam ◽

Chemical Properties ◽

Intermetallic Alloys ◽

Transmission Electron ◽

Diamond Polishing ◽

Al Composite ◽

The Matrix ◽

Argon Ion ◽

And Chemical Properties

The addition of fibres or particles (TiB2, SiC etc.) into TiAl intermetallic alloys could increase their toughness without compromising their good high temperature mechanical and chemical properties. This paper briefly discribes the microstructure developed by a TiAl/TiB2 composite material fabricated with the XD™ process and forged at 960°C.The specimens for transmission electron microscopy (TEM) were prepared in the usual way (i.e. diamond polishing and argon ion beam thinning) and examined on a JEOL 4000EX for microstucture and on a Philips 400T equipped with a SiLi detector for microanalyses.The matrix was predominantly γ (TiAl with L10 structure) and α2(TisAl with DO 19 structure) phases with various morphologies shown in figure 1.

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