High-Temperature Ordered Intermetallic Alloys VII: Symposium Held December 2-5, 1996, Boston, Massachusetts, U.S.A.

by Koch, C. C.; Liu, C. T.; Stoloff, N. S.; Wanner, A.

• ISBN13: 9781558993648
• ISBN10: 1558993649
• Format: Hardcover
• Copyright: 1999-03-01
• Publisher: Cambridge Univ Pr

Summary

Many advances in research and development have been made since the first MRS symposium on high-temperature ordered intermetallic alloys was held in 1984. That conference demonstrated a resurgence of interest in potential uses of intermetallic alloys for structural applications. Blossoming research in the field brings us to this book which has focused specifically on processing and microstructural control, alloy design, mechanical properties and industrial applications. Examples of structural applications of the 'mature' intermetallics, TiAl and Ni3Al are also featured. Evidence also suggests that high-melting-temperature refractory or platinum group metal-based intermetallics, still in the 'exotic' category, may yet represent the best potential for a breakthrough in high-temperature performance. Topics include: processing; titanium aluminides; creep and fatigue of titanium aluminides; iron aluminides; nickel aluminides; refractory metal-based and other intermetallics and composites.

Table of Contents

Preface
Acknowledgments
Materials Research Society Symposium Proceedings
Phase Stability in Processing of High-Temperature Intermetallic Alloys	p. 3
Commercialization Status of Ni[subscript 3]Al-Based Alloys	p. 15
Processing, Properties, and Applications of Gamma Titanium Aluminide Sheet and Foil Materials	p. 29
Effect of Initial Microstructure on the Compactibility of Rapidly Solidified Ti-Rich TiAl Powder	p. 45
Deformation of Diffusion-Bonded Bi-PST and Directionally Solidified Crystals of TiAl	p. 53
Strain Rate Sensitivity of Mechanical Properties and Related Thermal Activation Process in a Two-Phase [gamma]-Titanium Aluminide	p. 65
Ductility Improvement of Direct-Cast Gamma TiAl-Based Alloy Sheet	p. 71
Solution and Precipitation Hardening in Carbon-Doped Two-Phase [gamma]-Titanium Aluminides	p. 77
Key Microstructures Controlling the Mechanical Properties of Two-Phase TiAl Alloys With Lamellar Structures	p. 83
Alloying Effect of Vanadium Upon Structure and Strength of [delta]-Phase Titanium Trialuminide	p. 91
The Effect of Aluminum on the Formation of Orthorhombic Plates in the Nb-Ti-Al Ternary System	p. 97
Microstructure Analysis of Melt-Spun Al[subscript 3]Ti Intermetallics by XRD and EXAFS	p. 103
The Yield Stress of the Fully-Lamellar Microstructure	p. 109
Fracture Toughness of Stoichiometric, Nonstoichiometric, and Ternary-Alloyed Al[subscript 2]Ti	p. 115
Temperature Dependence of Fracture Toughness of the Cubic (L1[subscript 2]) Titanium Trialuminides	p. 121
Processing-Property-Microstructure Relationships in TiAl-Based Alloys	p. 127
Formation of Fine [gamma] Grain Structure Through Fine [actual symbol not reproducible] Lamellar Structure in Ti-Rich TiAl Alloy	p. 135
Mechanical Anisotropy in Sheets of [gamma]-TiAl Alloys	p. 141
Plasticity and Interfacial Dislocation Structures in Ti-Al	p. 147
Nanocrystalline TiAl Compacts Prepared by HDDR and Hot Pressing	p. 153
Microstructure, Mechanical Properties, and High-Temperature Oxidation Resistance of Boronized [gamma]-TiAl(Mn)	p. 159
Al-21Ti-23Cr High-Temperature Protective Coating on TiAl Intermetallic Compounds by rf-Magnetron Sputtering	p. 165
Tensile and Compression Testing of Single-Crystal Gamma Ti-55.5 Al	p. 171
Influence of Microstructure Refinement on Strength, Ductility, and Toughness of TiAl Alloys	p. 177
Hall-Petch and Multiple Linear Regression Equations for the Prediction of Mechanical Properties in Gamma-Based Titanium Aluminides	p. 183
Deformation of Polysynthetically Twinned (PST) TiAl Crystals at High-Strain Rate and High Temperature	p. 189
Tensile Properties and Deformation Mechanisms in Two-Phase Titanium Aluminide Sheet Material	p. 195
Microstructure of Massively-Transformed [gamma]-TiAl Phase Studied by High-Resolution Electron Microscopy	p. 201
Static and Dynamic Strain Aging in Two-Phase [gamma]-Titanium Aluminides	p. 207
TEM Characterization of Planar Defects in a Massively-Transformed TiAl Alloy	p. 213
Ultrafine Fully-Lamellar Structures in Two-Phase [gamma]TiAl Alloys	p. 219
Influence of Si and W Additions on High Temperature Oxidation of [actual symbol not reproducible] Ti-Al Alloys	p. 225
Shear Transmission in Lamellar Ti-48 at.% Al	p. 231
Slip of c + a/2 Dislocations in Ti[subscript 3]Al Single Crystals Strained in Tension Along the c-Axis	p. 237
Texture Studies of Gamma-Titanium-Aluminide Sheets Produced by Melt Overflow Rapid Solidification	p. 243
Measurement of Twinning Elements in PST TiAl Single Crystal	p. 249
Microstructural Changes During Long-Term Tension Creep of Two-Phase [gamma]-Titanium Aluminide Alloys	p. 257
Transient Creep Behavior of [gamma]-TiAl Polycrystals	p. 263
Monotonic and Transient Creep Experiments for Single-Phase Gamma TiAl at Intermediate Temperatures	p. 269
Deformation Mechanisms Responsible for the Creep Resistance of Ti-Al Alloys	p. 275
Effect of Interstitial Concentration and Heat Treatment on Microstructure and Primary Creep of Investment Cast Ti-47Al-2Nb-2Mn With 0.8v% TiB[subscript 2]	p. 281
Creep Deformation of Fully Lamellar Gamma-Based Titanium Aluminide Alloy	p. 287
Effect of Stress on Creep of Lamellar Near [gamma]-TiAl	p. 293
Microstructure Control in Iron Aluminides by Phase Decomposition or by Mechanical Alloying for Improved Strength and Ductility	p. 301
Yield Stress Anomaly in B2 FeAl	p. 313
The Effect of Heat Treatment on the Microstructure and Properties of FeAl+Cr	p. 325
A New Tetragonal Boride Phase in FeAl+B Type Alloys	p. 331
Plasticity, Dislocation Structures, and Antiphase Boundary Energies in Fe[subscript 3]Al Single Crystals With Chromium	p. 337
The Charpy Impact Behavior of Fe[subscript 3]Al and Fe[subscript 3]Al-20 at.% Mn Alloys	p. 343
The Effect of Ti Addition on Oxidation Behavior of FeAl Intermetallic Alloy	p. 349
On the Mechanism of Milling-Induced Disordering in AlFe	p. 355
Low Cycle Fatigue of FeAl (42 at.% Al) at Room Temperature	p. 361
Annealing of Cold-Rolled Fe-40Al Single Crystals	p. 367
A Model for the Yield Strength Anomaly in FeAl	p. 373
Strength, Thermal Defects, and Solid-Solution Hardening in Nickel-Containing B2 Iron Aluminides	p. 379
Examination of Dislocation Structures Near Crack Tip Region of B2 NiAl Alloys	p. 387
Effect of Prestraining on the Brittle-to-Ductile Transition of NiAl Single Crystals	p. 393
Atomistic Aspects of Crack Propagation Along High Angle Grain Boundaries	p. 399
Preparation, Deformation, and Fracture of Stoichiometric NiAl Single Crystals	p. 407
Microstructure and Strengthening of Creep-Tested Cryomilled NiAl-AlN	p. 413
Mechanical Properties of Binary Ni[subscript 3]Al Single Crystals	p. 419
The Ductility of Stoichiometric and Ni-Rich Polycrystals of Ni[subscript 3]Al: The Effect of Strain Rate	p. 425
Orientation Dependence of High-Temperature Creep Strength and Internal Stress in Ni[subscript 3]Al Alloy Single Crystals	p. 431
Primary Creep of Ni[subscript 3](Al, Ta) Single Crystals at Room Temperature	p. 437
Atomistic Simulations of Ti Additions to NiAl	p. 443
Microstructural Stability of Directionally-Solidified Eutectic NiAl-Mo Under Static and Thermal Cycling Conditions	p. 449
In situ TEM Observations of Cross-Slip Mechanisms in NiAl With a Soft Orientation	p. 455
Investigation of Superplastic Behavior of NiAl and Ni[subscript 3]Al Duplex Alloy	p. 461
TEM In situ Study of Dislocation Motion in B2 NiAl Single Crystals	p. 467
Comparison of the Creep Properties of Cast and Powder Metallurgy-Extruded Binary NiAl	p. 473
The Solid-Solution Alloying Effects of Ti on the High-Temperature Deformation Behavior of NiAl Single Crystals	p. 479
Powder Processing of NiAl for Elevated Temperature Strength	p. 487
Dislocation Substructure of NiAl Single Crystals Deformed at Ambient Temperature	p. 493
Strain Aging Behavior in NiAl Microalloyed With Interstitial and Substitutional Solutes	p. 499
Slip Transition and Dislocation Structures in Off-Stoichiometric NiAl Single Crystals	p. 505
Ductility Response of Ni[subscript 3]Al-Zr-B-Base Alloys With Ternary Elements to Strain Rate and High Temperature	p. 511
Practical Design of Ni[subscript 3]Al With High Hot Workability	p. 517
An Explanation of the Small Strain-Rate Sensitivity of Ni[subscript 3]Al	p. 523
Dislocation Structures in Ni[subscript 3](Al, Hf)	p. 529
Modeling of the Dislocation Dynamics in Ni[subscript 3]Al and the Flow Stress Anomaly	p. 535
An Analysis of the Slip of Screw Dislocations in L1[subscript 2] Alloys	p. 541
Stress Response by the Strain-Rate Change in Binary, Stoichiometric Ni[subscript 3]Al Single Crystal	p. 549
Notch-Tip Deformation of Ni[subscript 3]Al Single Crystals	p. 555
Fabrication of NiAl Intermetallic From Dense Elemental Powder Blends Via Solid State Reactions	p. 561
Creep in Single Crystal Ni[subscript 3]Al	p. 567
Recent Work on Environmental Embrittlement in Silicides	p. 575
Lattice Defects Affecting Moisture-Induced Embrittlement of Ni-Based L1[subscript 2]-Ordered Intermetallics	p. 587
Effect of Microstructure on the Properties of MoSi[subscript 2] and Its Composites	p. 593
Stacking Faults on (001) in Transition-Metal Disilicides with the C11[subscript b] Structure	p. 599
Plastic Deformation of Mo(Si,Al)[subscript 2] Single Crystals With the C40 Structure	p. 605
Preparation, Structure, and Mechanical Properties of RuAl and (Ru,Ni)Al Alloys	p. 611
Site Occupancies in Ternary C15-Ordered Laves Phases	p. 617
Elastic Constants of a Laves Phase Compound: C15 NbCr[subscript 2]	p. 623
Creep of Anomalous Ni[subscript 3]Ga	p. 629
Anomalous Temperature Dependence of Yield Stress and Work-Hardening Coefficient of B2-Stabilized NiTi Alloys	p. 635
Relating Mechanical Properties With Dislocation Cores in Ni[subscript 3]Ge-Fe[subscript 3]Ge Intermetallic Alloys	p. 641
Chemistry, Bonding, and Fracture of Grain Boundaries in Ni[subscript 3]Si	p. 647
Yield-Point Phenomenon and Serrated Yielding in Nb-40Ti-15Al	p. 653
Phase Relation and Microstructure of NbCr[subscript 2] Laves Intermetallics in Ternary Nb-Cr-X Alloy Systems	p. 659
Creep Behavior of MoSi[subscript 2] with Si[subscript 3]N[subscript 4] Reinforcements	p. 665
The Mechanical Behavior and Deformation Mechanisms of Nb-Al-V Alloys	p. 671
Laves Phase-Based Materials: Microstructure, Deformation Modes, and Properties	p. 677
Comparison of NbCr[subscript 2] and HfV[subscript 2] C15 Laves Phases	p. 689
Assessment of the Compositional Influences on the Toughness of TiCr[subscript 2]-Base Laves Phase Alloys	p. 695
Platinum Group Metals-Base Refractory Superalloys	p. 701
High-Temperature Mechanical Behavior of B2 Type IrAl Dopped With Ni	p. 707
Ti-Modified Niobium-Silicide-Based Directionally Solidified In situ Composites	p. 715
Mechanical Behavior of Molybdenum-Modified Cr[subscript 3]Si/Cr[subscript 5]Si[subscript 3] Intermetallics	p. 727
Reactive Infiltration Processing of Bulk and Fiber-Reinforced NiAl	p. 737
Effects of Rhenium Alloying on the Microstructures and Mechanical Properties of Directionally-Solidified NiAl-Mo Eutectic Alloy	p. 743
Mechanical Behavior of Reactively Hot-Pressed Aluminide Matrix Composites	p. 755
Al[subscript 2]O[subscript 3] Composites Containing Fe, Nb, and Zr Aluminides	p. 761
Y[subscript 2]O[subscript 3] Morphology in an Oxide Dispersion-Strengthened FeAl Alloy Prepared by Mechanical Alloying	p. 767
Author Index	p. 773
Subject Index	p. 777
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