scholarly journals Fracture and fatigue resistance of Mo–Si–B alloys for ultrahigh-temperature structural applications

2004 ◽  
Vol 50 (4) ◽  
pp. 459-464 ◽  
Author(s):  
J.J. Kruzic ◽  
J.H. Schneibel ◽  
R.O. Ritchie
Keyword(s):  
Fatigue Resistance ◽  
Structural Applications ◽  
Ultrahigh Temperature

ALCOA 2026

Alloy Digest ◽  
2006 ◽  
Vol 55 (10) ◽  
Keyword(s):  
Compressive Strength ◽  
Corrosion Resistance ◽  
Tensile Properties ◽  
Fatigue Resistance ◽  
Selection Criteria ◽  
Damage Tolerance ◽  
Structural Applications ◽  
Extrusion Alloy ◽  
High Degree

Abstract Alcoa extrusion alloy 2026 was developed as an improvement over 2024 and 2224 extrusions in aerospace structural applications where the governing selection criteria are high damage tolerance, good fatigue resistance, and a high degree of manufacturability. In addition to improved damage tolerance, extrusion alloy 2026-T3511 also has a significantly higher A-basis minimum strength than 2024-T3511 and 2224-T3511. This datasheet provides information on composition, tensile properties, and compressive strength as well as fatigue. It also includes information on corrosion resistance as well as forming. Filing Code: AL-401. Producer or source: AEAP-Alcoa Engineered Aerospace Products.

Mo-Si-B Alloys for Ultrahigh-Temperature Structural Applications

2012 ◽  
Vol 24 (26) ◽  
pp. 3445-3480 ◽  
Author(s):  
J. A. Lemberg ◽  
R. O. Ritchie
Keyword(s):  
Structural Applications ◽  
Ultrahigh Temperature

ALCOA 2024 PLATE

Alloy Digest ◽  
2000 ◽  
Vol 49 (9) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Yield Strength ◽  
Physical Properties ◽  
Surface Treatment ◽  
Tensile Properties ◽  
Fatigue Resistance ◽  
Structural Applications

Abstract Alcoa 2024 was introduced by Alcoa in 1931 as the first alloy to have a yield strength approaching 345 MPa (50 ksi). With relatively good fatigue resistance in plate forms, alloy 2024 continues in many aerospace structural applications. This datasheet provides information on composition, physical properties, and tensile properties as well as fatigue. It also includes information on corrosion resistance as well as surface treatment. Filing Code: AL-372. Producer or source: Alcoa Mill Products Inc.

Adhesives for Elevated-Temperature Applications

MRS Bulletin ◽  
2003 ◽  
Vol 28 (6) ◽  
pp. 428-433 ◽  
Author(s):  
S. Millington ◽  
S. J. Shaw
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Thermal Resistance ◽  
Oxidative Stability ◽  
Fatigue Resistance ◽  
Epoxy Resins ◽  
Bonded Joints ◽  
Temperature Performance ◽  
Structural Applications ◽  
Significant Effort

AbstractAlthough adhesives, particularly those based on epoxy resins, are finding increasing use in structural applications, their utilization at elevated temperature (>150°C) has been limited by their relatively poor thermal and thermo-oxidative stability. As a result, significant effort has been directed in recent years toward the development of polymers exhibiting increased thermal resistance. Although a wealth of research conducted over several decades has resulted in a myriad of polymer types exhibiting, in some cases, impressive high-temperature performance, many systems have demonstrated poor processability Thus, much emphasis has been placed on developing high-temperature performance while providing processability characteristics that are similar, if not identical, to epoxies. This article considers the various approaches that have been shown to offer such dual capabilities. In addition, the results of various studies undertaken to investigate the effects of elevated temperature on the strength and fatigue resistance of bonded joints are reported.

Lattice Imaging of Grain Boundaries in Ceramics

1977 ◽  
Vol 35 ◽  
pp. 114-115
Author(s):  
D. R. Clarke ◽  
G. Thomas
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Silicon Nitride ◽  
Grain Boundaries ◽  
High Temperature Strength ◽  
Current Interest ◽  
Lattice Imaging ◽  
Special Significance ◽  
Structural Applications ◽  
Refractory Ceramics

Grain boundaries have long held a special significance to ceramicists. In part, this has been because it has been impossible until now to actually observe the boundaries themselves. Just as important, however, is the fact that the grain boundaries and their environs have a determing influence on both the mechanisms by which powder compaction occurs during fabrication, and on the overall mechanical properties of the material. One area where the grain boundary plays a particularly important role is in the high temperature strength of hot-pressed ceramics. This is a subject of current interest as extensive efforts are being made to develop ceramics, such as silicon nitride alloys, for high temperature structural applications. In this presentation we describe how the techniques of lattice fringe imaging have made it possible to study the grain boundaries in a number of refractory ceramics, and illustrate some of the findings.

Precipitation in Al-Li-Cu Alloys

1981 ◽  
Vol 39 ◽  
pp. 44-45
Author(s):  
J. E. O'Neal ◽  
K. K. Sankaran
Keyword(s):  
Electron Microscopy ◽  
Age Hardening ◽  
Precipitation Behavior ◽  
Zone Formation ◽  
Specific Strength ◽  
Hardening Behavior ◽  
Cu Alloys ◽  
High Specific Strength ◽  
Transmission Electron ◽  
Structural Applications

Al-Li-Cu alloys combine high specific strength and high specific modulus and are potential candidates for aircraft structural applications. As part of an effort to optimize Al-Li-Cu alloys for specific applications, precipitation in these alloys was studied for a range of compositions, and the mechanical behavior was correlated with the microstructures.Alloys with nominal compositions of Al-4Cu-2Li-0.2Zr, Al-2.5Cu-2.5Li-0.2Zr, and Al-l.5Cu-2.5Li-0.5Mn were argon-atomized into powder at solidification rates ≈ 103°C/s. Powders were consolidated into bar stock by vacuum pressing and extruding at 400°C. Alloy specimens were solution annealed at 530°C and aged at temperatures up to 250°C, and the resultant precipitation was studied by transmission electron microscopy (TEM).The low-temperature (≲100°C) precipitation behavior of the Al-4Cu-2Li-0.2Zr alloy is a combination of the separate precipitation behaviors of Al-Cu and Al-Li alloys. The age-hardening behavior at these temperatures is characteristic of Guinier-Preston (GP) zone formation, with additional strengthening resulting from the coherent precipitation of δ’ (Al3Li, Ll2 structure), the presence of which is revealed by the selected-area diffraction pattern (SADP) shown in Figure la.

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