Plastic Deformation of Directionally-Solidified MoSi2/Mo5Si3 Eutectic Composites

2013 ◽  
Vol 1516 ◽  
pp. 195-200 ◽  
Author(s):  
Yuta Sasai ◽  
Atsushi Inoue ◽  
Kosuke Fujiwara ◽  
Kyosuke Kishida ◽  
Haruyuki Inui
Keyword(s):  
Plastic Deformation ◽  
Yield Stress ◽  
Deformation Behavior ◽  
Growth Direction ◽  
Average Thickness ◽  
Floating Zone ◽  
Directionally Solidified ◽  
Zone Method ◽  
Increasing Temperature ◽  
Loading Axis

ABSTRACTDeformation behavior of the directionally-solidified MoSi2/Mo5Si3 eutectic composites has been investigated as a function of the average thickness of MoSi2 phase over a temperature range from 900 to 1500°C. The average thickness of both MoSi2 and Mo5Si3 phases in the directionally-solidified ingots with script-lamellar morphologies grown by optical floating zone method decreases with increasing the growth rate. Plastic deformation was observed above 1000°C for all the DS ingots grown at different growth rates when the loading axis is parallel to [1¯10]MoSi2 close to the growth direction. Yield stress decreases monotonically with increasing temperature. Yield stress at 1400°C increases drastically with decreasing the average thickness of MoSi2 phase.

Microstructure and Deformation Behavior of Lamellar Ti-Rich TiAl Crystal with Lotus-Type Aligned Pores

2007 ◽  
Vol 561-565 ◽  
pp. 383-386 ◽  
Author(s):  
Takayoshi Nakano ◽  
Takahiro Tachibana ◽  
Koji Hagihara ◽  
Yukichi Umakoshi ◽  
Takuya Ide ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Yield Stress ◽  
Deformation Behavior ◽  
Lamellar Structure ◽  
Mixed Gas ◽  
Zone Method ◽  
Two Phase ◽  
Porous Ti ◽  
Plastic Deformation Behavior ◽  
Cylindrical Pores

A porous Ti-48.0at.%Al (Ti-rich TiAl) crystal, in which lotus-type long cylindrical pores were aligned and (γ/α2) two-phase lamellar structure was simultaneously developed, was fabricated by floating zone method under the pressure of hydrogen and helium mixed gas. Plastic deformation behavior and microstructure of the Ti-rich TiAl crystal with lotus-type aligned pores were investigated by focusing on the elongated pore direction. The as-grown and annealed crystals show a well-developed lamellar structure and no texture accompanied by 52% porosity and a mean pore diameter of 380 μm. Yield stress strongly depends on the loading direction against the elongated pore. When loading directions are parallel and perpendicular to the pore direction, yield stresses obey K=1 and 2.5, respectively, in equation of σ=σ0(1-p)K, where σ is the yield stress with pores, σ0 is the yield stress without pores and p is porosity. This reflects macroscopically homogeneous and locally heterogeneous plastic deformation between pores, respectively.

Phase Orientation of a TiC-TiB2-SiC Ternary Eutectic Composite Prepared by An FZ Method

2007 ◽  
Vol 534-536 ◽  
pp. 1057-1060 ◽  
Author(s):  
Rong Tu ◽  
Wenjun Li ◽  
Takashi Goto
Keyword(s):  
Eutectic Composition ◽  
Ternary Eutectic ◽  
Growth Direction ◽  
Floating Zone ◽  
Eutectic Composite ◽  
Zone Method ◽  
Floating Zone Method ◽  
Specific Relationship ◽  
Lamellar Texture

The TiC-TiB2-SiC system was a ternary eutectic, whose eutectic composition was 34TiC-22TiB2-44SiC (mol%). A TiC-TiB2-SiC ternary eutectic composite were synthesized via the floating zone method using TiC, TiB2 and SiC powders as starting materials. The TiC-TiB2-SiC eutectic composite showed a lamellar texture. TiC(022), TiB2(010) and SiC(111) of the eutectic composite were perpendicular to the growth direction. The TiC-TiB2-SiC ternary eutectic composite had a specific relationship among the crystal planes: TiC[011]//TiB2[010]//SiC[112], TiC(200)// TiB2(001)//SiC( 402 ) and TiC(111)//TiB2(101)//SiC( 220 ).

Microstructure and Plastic Deformation Behavior of Ni3V Single Crystals

2007 ◽  
Vol 561-565 ◽  
pp. 407-410 ◽  
Author(s):  
Koji Hagihara ◽  
Mayumi Mori ◽  
Yukichi Umakoshi
Keyword(s):  
Plastic Deformation ◽  
Single Crystals ◽  
Yield Stress ◽  
High Temperatures ◽  
Low Temperatures ◽  
Deformation Behavior ◽  
Plastic Deformation Behavior ◽  
Rapid Drop

Plastic deformation behavior of Ni3V with D022 structure was examined using the single crystals containing two dominant variants of three. At [557] loading orientation, {111}1/6<112] twinning is dominantly operative at low temperatures, but {111}1/2<112] slip is activated at high temperatures accompanied by a rapid drop of yield stress.

Mechanical and Microstructural Behaviors of Directionally Solidified Al2O3/Al16Ti5O34 Eutectics

2013 ◽  
Vol 446-447 ◽  
pp. 224-229
Author(s):  
Serkan Abali
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Raman Spectroscopy ◽  
Crystal Temperature ◽  
Floating Zone ◽  
Directionally Solidified ◽  
Zone Method ◽  
Flexure Strength ◽  
Floating Zone Method ◽  
The Relationship

In this work, rods of Al2O3–TiO2eutectics containing 65 and 60 wt% Al2O3were grown using the laser floating zone method. Raman spectroscopy was used to determine the phase composition. Creep strength of Al2O3–Al16Ti5O34(65AT) eutectic at 1500°C has 320 MPa, which is about higher thanβ–Al2TiO5/Al2O3(60AT) crystal. Temperature dependence flexure strength, hardness, elasticity and fracture toughness of the Al2O3–Al16Ti5O34andβ–Al2TiO5/Al2O3crystals were analyzed. The relationship between the microstructure and the mechanical properties were analyzed the 60 and 65AT eutectic crystals.

scholarly journals Characterization of Directionally Solidified B4C-TiB2 Composites Prepared by a Floating Zone Method

2002 ◽  
Vol 43 (4) ◽  
pp. 712-720 ◽  
Author(s):  
Itaru Gunjishima ◽  
Takaya Akashi ◽  
Takashi Goto
Keyword(s):  
Floating Zone ◽  
Directionally Solidified ◽  
Zone Method ◽  
Floating Zone Method

Microstructural Factors Affecting the Deformation Behavior of Mg12ZnY LPSO-Phase Alloys

2012 ◽  
Vol 706-709 ◽  
pp. 1158-1163 ◽  
Author(s):  
Koji Hagihara ◽  
Akihito Kinoshita ◽  
Yoshihiro Fukusumi ◽  
Michiaki Yamasaki ◽  
Yoshihito Kawamura
Keyword(s):  
Plastic Deformation ◽  
Yield Stress ◽  
Deformation Behavior ◽  
Basal Slip ◽  
The Other ◽  
Factors Affecting ◽  
Lpso Phase ◽  
Long Period ◽  
Other Hand

Microstructural factors that govern the plastic deformation of the long-period stacking ordered (LPSO) phase were clarified. The decrease in length of the long-axis for the plate-like shape of LPSO-phase grains increases the yield stress of the alloy in which basal slip is predominant in deformation. On the other hand, the yield stress tended to increase as the thickness of the plate-like shapes of the grains decreased for the alloy in which the formation of deformation kinks carried the strain.

Deformation Behavior of NiAl-Based Alloys Containing Iron, Cobalt, and Hafnium

1988 ◽  
Vol 133 ◽  
Author(s):  
D. R. Pank ◽  
M. V. Nathal ◽  
D. A. Koss
Keyword(s):  
Yield Stress ◽  
Deformation Behavior ◽  
Single Phase ◽  
Flow Behavior ◽  
Iron Cobalt ◽  
Alloying Additions ◽  
Compressive Flow ◽  
Melt Spun ◽  
Increasing Temperature

ABSTRACTThe effects of alloying additions on the mechanical properties of the B2 intermetallic NiAl have been investigated in both the melt-spun ribbon and consolidated, bulk form. The study is based on a matrix of NiAl-based alloys with up to 20 a/o Co and Fe additions and with reduced Al levels in the range of 30 – 40 a/o. Characterization of the melt-spun ribbon by optical and scanning electron microscopy indicates a range of microstructures: single phase β γ, necklace phase surrounding either martensitic or β grains, and a mixture of equiaxed martensitic and γ grains. Bend ductility is present in melt-spun and annealed ribbons exhibiting the γ necklace structure and in a single phase β material containing 20 a/o Fe.The analysis of compressive flow behavior on consolidated, bulk specimens indicates that the single phase γ alloys exhibit a continuous decrease in yield stress with increasing temperature and profuse microcracking at grain boundaries. In contrast, multiphase (γ + either martensite or β) alloys tend to display a peak in flow stress between 600 and 800K with little or no signs of microcracking. In general, heat treatments which convert the martensitic grains to β + γ result in improved strength at temperatures above 600K and better resistance to crack initiation. These results are discussed in terms of the effects of β, martensite and γ on the yield stress and flow behavior of NiAl-based alloys.

Plastic and Elastic Behavior of Sputtered Bilayered Films by Nanoindedtation

1999 ◽  
Vol 594 ◽  
Author(s):  
N. Kikuchi ◽  
E. Kusano ◽  
Y. Sawahira ◽  
A. Kinbara
Keyword(s):  
Plastic Deformation ◽  
Elastic Modulus ◽  
Yield Stress ◽  
Sapphire Substrate ◽  
Elastic Energy ◽  
Deformation Behavior ◽  
Elastic Behavior ◽  
Dissipated Energy ◽  
Displacement Curve ◽  
Plastic Energy

AbstractDeformation behavior of sputtered Al/TiN and Cu/TiN bilayered films was examined by using dissipated and elastic energies estimated from the area enclosed by the load-displacement curve of nanoindentation. These films studied consisted of TiN top-layer of 500 nm and Al or Cu underlayer of 0 - 500 nm on glass or sapphire substrate. The dissipated energy for plastic deformation increased with increasing thickness of metal underlayer, while the elastic energy remained constant. A decrease in plastic energy was observed by changing the underlayer material from Al to Cu. Further, a reduction in elastic energy was observed when a sapphire was used as a substrate. Experimental results show that the plastic deformation mainly occurred in metal underlayer and the elastic deformation did in TiN layer and in the substrate. It was concluded that the yield stress and elastic modulus of layers and substrate strongly affect the deformation behavior of the films.

Deformation Behavior of Magnesium Single Crystal in c-Axis Compression and a-Axis Tension

2010 ◽  
Vol 654-656 ◽  
pp. 699-702 ◽  
Author(s):  
Shinji Ando ◽  
Masayuki Tsushida ◽  
Hiromoto Kitahara
Keyword(s):  
Yield Stress ◽  
Deformation Behavior ◽  
Compression Fracture ◽  
Anomalous Temperature ◽  
Twin Interface ◽  
Tension Tests ◽  
Axis Compression ◽  
Higher Temperature ◽  
General Deformation ◽  
Increasing Temperature

In general, deformation behavior of magnesium in compression is different from tensile. To investigate deformation behavior of magnesium single crystals by non-basal slips and twins, c-axis compression and a-axis tension tests were performed in the range of 77K-573K. The crystals were yielded by second order pyramidal slip, and the yield stress shows anomalous temperature dependence (increased with increasing temperature) between 203K and 293K. Yield stress of c-axis compression was bigger than that of a-axis tensile. In compression, fracture surface were (11 4) under 293K and were {30 4} above 373K, and fracture strain was smaller than the case of tension test. {10 1}-{10 2} double twin were activated at higher temperature and the crystal, therefore, fractured along the twin interface.

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