Application of X-Ray Examination to Fracture Surface of Ti A1 Intermetallic Compound

1993 ◽  
Vol 37 ◽  
pp. 335-342
Author(s):  
Hiroyukt Tabata ◽  
Zenjiro Yajima ◽  
Toshihiko Sasaki ◽  
Yukio Hirose
Keyword(s):  
Fracture Toughness ◽  
High Temperature ◽  
Intermetallic Compound ◽  
Fracture Surface ◽  
Beneficial Effect ◽  
Titanium Aluminide ◽  
Lamellar Microstructure ◽  
New Materials ◽  
X Ray ◽  
Structural Applications

Titanium aluminide base allays are new materials of interest with exellent potential for high temperature structural applications. Several studies on the fracture toughness of these alloys have been reported and the beneficial effect of lamellar microstructure consisting of Ti3Al(α2) and TiAl(γ) has been detected. While these studies indicate such an enhancement of the fracture toughness is caused by micro-crack toughening, SEM observation alone is insufficient to clarify the fracture mechanism.

Recent Advances in Development and Processing of Titanium Aluminide Alloys

2000 ◽  
Vol 646 ◽  
Author(s):  
Fritz Appel ◽  
Helmut Clemens ◽  
Michael Oehring
Keyword(s):  
High Temperature ◽  
Titanium Aluminide ◽  
Titanium Aluminides ◽  
Environmental Stability ◽  
Physical Metallurgy ◽  
Specific Strength ◽  
Wide Range ◽  
Structural Applications ◽  
Strength And Stiffness ◽  
Nickel Base

ABSTRACTIntermetallic titanium aluminides are one of the few classes of emerging materials that have the potential to be used in demanding high-temperature structural applications whenever specific strength and stiffness are of major concern. However, in order to effectively replace the heavier nickel-base superalloys currently in use, titanium aluminides must combine a wide range of mechanical property capabilities. Advanced alloy designs are tailored for strength, toughness, creep resistance, and environmental stability. Some of these concerns are addressed in the present paper through specific comments on the physical metallurgy and technology of gamma TiAl-base alloys. Particular emphasis is placed on recent developments of TiAl alloys with enhanced high-temperature capability.

X-Ray Residual Stress Measurement on Stress Corrosion Fracture Surfaces

1992 ◽  
Vol 36 ◽  
pp. 543-549
Author(s):  
Masaaki Tsuda ◽  
Yukio Hirose ◽  
Zenjiro Yajima ◽  
Keisuke Tanaka
Keyword(s):  
Fracture Toughness ◽  
Residual Stress ◽  
Fracture Surface ◽  
Stress Corrosion ◽  
Stress Measurement ◽  
High Strength Steels ◽  
High Strength ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fracture Surfaces

X-ray fractography is a new method utilizing the X-ray diffraction technique to observe the fracture surface for the analysis of the micromechanisms and mechanics of fracture. X-ray residual stress has been confirmed to be a particularly useful parameter when studying the fracture surfaces of high strength steels. The method has been applied to the fracture surface of fracture toughness and fatigue specimens.

X-ray Residual Stress Measurement on Fracture Surface of Stress Corrosion Cracking

1989 ◽  
Vol 33 ◽  
pp. 327-334 ◽  
Author(s):  
Masaaki Tsuda ◽  
Yukic Hirose ◽  
Zenjiro Yajima ◽  
Keisuke Tanaka
Keyword(s):  
Fracture Toughness ◽  
Residual Stress ◽  
Fracture Surface ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Stress Measurement ◽  
High Strength Steels ◽  
High Strength ◽  
X Ray Diffraction ◽  
X Ray

X-ray fractography is a new method utilizing the X-ray diffraction technique to observe the fracture surface for the analysis of the micromechanisms and mechanics of fracture. The X-ray residual stress has been confirmed to be a particularly useful parameter when studying the fracture surfaces of high strength steels. The method has been applied to the fracture surface of fracture toughness and fatigue specimens.

X-ray Fractographic Study on Alumina and Zirconia Ceramics

1990 ◽  
Vol 34 ◽  
pp. 719-727 ◽  
Author(s):  
Sumio Tanaka ◽  
Yukio Hirose ◽  
Keisuke Tanaka
Keyword(s):  
Fracture Toughness ◽  
Residual Stress ◽  
Fracture Surface ◽  
High Strength Steels ◽  
High Strength ◽  
Fatigue Tests ◽  
Fracture Mechanisms ◽  
Zirconia Ceramics ◽  
X Ray ◽  
Fractographic Study

The residual stress left on the fracture surface is one of the important parameters in X-ray fractographic study. It has been used to analyze fracture mechanisms in fracture toughness and fatigue tests especially of high strength steels.In this paper, X-ray fractography was applied to brittle fracture of alumina (Al2O3) and zirconia (ZΓO2) ceramics.

Growth Characteristic and Fracture Toughness of Laser Rapidly Solidified Al2O3/YAG/ZrO2 Ceramic Eutectic In Situ Composite

2008 ◽  
Vol 33-37 ◽  
pp. 495-500
Author(s):  
Hai Jun Su ◽  
Jun Zhang ◽  
Lin Liu ◽  
Heng Zhi Fu
Keyword(s):  
Fracture Toughness ◽  
High Temperature ◽  
Laser Scanning ◽  
Growth Characteristic ◽  
Lamellar Microstructure ◽  
Eutectic Growth ◽  
Oxide Ceramic ◽  
Quick Method ◽  
Rapidly Solidified

Directionally solidified oxide ceramic eutectic composites with superior strength, oxidation resistance, creep resistance, structural stability and low sensitivity to crack at high temperature have aroused much attention in recent years, and various preparation techniques have been developed. In situ fabrication of ceramic eutectic composites by laser rapid solidification is a cheap and quick method compared to conventional multi-step fabrication methods of fiber reinforced composites for high temperature use. In this paper, Al2O3/YAG/ZrO2 ternary eutectics are rapidly prepared from melt by directional solidification using laser zone remelting technique, the growth characteristic and fracture toughness are investigated. The results show that: (1) Laser rapidly solidified Al2O3/YAG/ZrO2 ceramic eutectic in situ composite presents a fine interpenetrating network structure, in which Al2O3, YAG and ZrO2 phases are continually interconnected and finely coupled without pores, colonies and grain boundaries between interfaces. (2) Laser scanning rate and power density strongly affect the eutectic growth. With the processing parameters adjusted properly, the eutectic shows homogeneous and coupled lamellar microstructure. The characteristic dimensions of the microstructure are around 2~3 1m for Al2O3 and YAG phases, and around 0.2~1 1m for ZrO2 phases, respectively. (3) The hardness and fracture toughness of the rapidly solidified Al2O3/YAG/ZrO2 eutectic are 16.7 GPa and 8.0 MPa.m1/2, respectively.

BRUSH WELLMAN S-65B

Alloy Digest ◽  
1987 ◽  
Vol 36 (1) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
High Speed ◽  
Nuclear Reactors ◽  
Beryllium Oxide ◽  
Heat Treating ◽  
X Ray ◽  
Structural Applications ◽  
Optical Applications ◽  
Speed Computer

Abstract BRUSH WELLMAN S-65B is a grade of beryllium strengthened by a dispersion of beryllium oxide. It has moderate strength and fairly low ductility (a minimum of 3% elongation). Its uses include optical applications, nuclear reactors, instrumentation, X-ray windows, high-speed computer parts, audio components and aerospace structural applications. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Be-3. Producer or source: Brush Wellman Inc..

Toughening Effects of Carbon Nanotubes on 3Y-ZrO2 via Different Material Molding Technologies

2016 ◽  
Vol 703 ◽  
pp. 87-93 ◽  
Author(s):  
Cui Can Wang ◽  
Chang Lian Chen ◽  
Ma Yo Luo ◽  
Xiao Yu Huang ◽  
Zhi Liang Huang
Keyword(s):  
Carbon Nanotubes ◽  
Fracture Toughness ◽  
High Temperature ◽  
X Ray Diffraction ◽  
Compression Moulding ◽  
X Ray ◽  
Gel Casting ◽  
High Temperature Furnace ◽  
Better Than ◽  
Temperature Furnace

In order to research the toughening effects of carbon nanotubes on 3Y-ZrO2 via different moulding methods. 3Y-ZrO2 and 3Y-ZrO2 with two kind of carbon nanotubes were prepared by compression moluding forming and gel-casting. And all of the green bodies were sintering at 1600°C in high temperature furnace. The X-ray diffraction and density of sintered bodies, microstructural of fracture surface and fracture toughness were characterized and analyzed. Results shown that gel-casting is better than compression about toughening 3Y-ZrO2 by carbon nanotubes. For gel-casting, the density is nearly the same and fracture toughness has been improved which is form 5.17MPa·m1/2 to 5.63 MPa·m1/2. For compression moulding forming, the density was reduced by the aggregation of carbon nanotubes. The fracture toughness can’t improve by carbon nanotubes.

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