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Author: D. Hardwick Publisher: ISBN: Category : Languages : en Pages : 39
Book Description
Microstructural evolution in near-gamma TiAl alloys during hot working is a complex interaction involving solid state diffusion, dynamic recrystallization and non-uniform strain accommodation. Compression workability testing, coupled with extensive metallographic characterization, has been used to study the evolution of microstructural refinement and chemical homogeneity in three near-gamma TiAl alloys: Ti-46Al-0.2B, Ti-48Al-0.2B and Ti-48Al-2Mo-0.2B. Hot working of materials that had undergone an homogenization heat treatment resulted in the breakup of the initial fully lamellar microstructures into isolated islands of lamellae surrounded by fine bands of dynamically recrystallized grains. Using material that had been initially forged to a strain of 0.9 at 1150 deg C with a strain rate of 10(exp -3)/sec, the effect of additional thermal and mechanical working steps was examined. Particular attention was paid to the effect of strain path on the behavior of the remnant lamellar colonies. Strain in the same direction as the first forging had little effect in breaking-up lamellar colonies lying in the plane of the forging while strain applied perpendicular to this direction was more effective in encouraging these features to undergo enough strain to recrystallize.
Author: D. Hardwick Publisher: ISBN: Category : Languages : en Pages : 39
Book Description
Microstructural evolution in near-gamma TiAl alloys during hot working is a complex interaction involving solid state diffusion, dynamic recrystallization and non-uniform strain accommodation. Compression workability testing, coupled with extensive metallographic characterization, has been used to study the evolution of microstructural refinement and chemical homogeneity in three near-gamma TiAl alloys: Ti-46Al-0.2B, Ti-48Al-0.2B and Ti-48Al-2Mo-0.2B. Hot working of materials that had undergone an homogenization heat treatment resulted in the breakup of the initial fully lamellar microstructures into isolated islands of lamellae surrounded by fine bands of dynamically recrystallized grains. Using material that had been initially forged to a strain of 0.9 at 1150 deg C with a strain rate of 10(exp -3)/sec, the effect of additional thermal and mechanical working steps was examined. Particular attention was paid to the effect of strain path on the behavior of the remnant lamellar colonies. Strain in the same direction as the first forging had little effect in breaking-up lamellar colonies lying in the plane of the forging while strain applied perpendicular to this direction was more effective in encouraging these features to undergo enough strain to recrystallize.
Author: Alessandra Varone Publisher: MDPI ISBN: 3039217704 Category : Technology & Engineering Languages : en Pages : 240
Book Description
In the industrial manufacturing of metals, the achievement of products featuring desired characteristics always requires the control of process parameters in order to obtain a suitable microstructure. The strict relationship among process parameters, microstructure, and mechanical properties is a matter of interest in different areas, such as foundry, plastic forming, sintering, welding, etc., and regards both well-established and innovative processes. Nowadays, circular economy and sustainable technological development are dominant paradigms and impose an optimized use of resources, a lower energetic impact of industrial processes and new tasks for materials and products. In this frame, this Special Issue covers a broad range of research works and contains research and review papers.
Author: James C M Li Publisher: World Scientific Publishing Company ISBN: 9813105658 Category : Technology & Engineering Languages : en Pages : 454
Book Description
This is the second volume of an advanced textbook on microstructure and properties of materials. (The first volume is on aluminum alloys, nickel-based superalloys, metal matrix composites, polymer matrix composites, ceramics matrix composites, inorganic glasses, superconducting materials and magnetic materials). It covers titanium alloys, titanium aluminides, iron aluminides, iron and steels, iron-based bulk amorphous alloys and nanocrystalline materials.There are many elementary materials science textbooks, but one can find very few advanced texts suitable for graduate school courses. The contributors to this volume are experts in the subject, and hence, together with the first volume, it is a good text for graduate microstructure courses. It is a rich source of design ideas and applications, and will provide a good understanding of how microstructure affects the properties of materials.Chapter 1, on titanium alloys, covers production, thermomechanical processing, microstructure, mechanical properties and applications. Chapter 2, on titanium aluminides, discusses phase stability, bulk and defect properties, deformation mechanisms of single phase materials and polysynthetically twinned crystals, and interfacial structures and energies between phases of different compositions. Chapter 3, on iron aluminides, reviews the physical and mechanical metallurgy of Fe3Al and FeAl, the two important structural intermetallics. Chapter 4, on iron and steels, presents methodology, microstructure at various levels, strength, ductility and strengthening, toughness and toughening, environmental cracking and design against fracture for many different kinds of steels. Chapter 5, on bulk amorphous alloys, covers the critical cooling rate and the effect of composition on glass formation and the accompanying mechanical and magnetic properties of the glasses. Chapter 6, on nanocrystalline materials, describes the preparation from vapor, liquid and solid states, microstructure including grain boundaries and their junctions, stability with respect to grain growth, particulate consolidation while maintaining the nanoscale microstructure, physical, chemical, mechanical, electric, magnetic and optical properties and applications in cutting tools, superplasticity, coatings, transformers, magnetic recordings, catalysis and hydrogen storage.
Author: Somnath Ghosh Publisher: Springer Science & Business Media ISBN: 1441906436 Category : Science Languages : en Pages : 669
Book Description
Computational Methods for Microstructure-Property Relationships introduces state-of-the-art advances in computational modeling approaches for materials structure-property relations. Written with an approach that recognizes the necessity of the engineering computational mechanics framework, this volume provides balanced treatment of heterogeneous materials structures within the microstructural and component scales. Encompassing both computational mechanics and computational materials science disciplines, this volume offers an analysis of the current techniques and selected topics important to industry researchers, such as deformation, creep and fatigue of primarily metallic materials. Researchers, engineers and professionals involved with predicting performance and failure of materials will find Computational Methods for Microstructure-Property Relationships a valuable reference.
Author: Don E. Bray Publisher: John Wiley & Sons ISBN: 0470294973 Category : Technology & Engineering Languages : en Pages : 650
Book Description
This volume is part of the Ceramic Engineering and Science Proceeding (CESP) series. This series contains a collection of papers dealing with issues in both traditional ceramics (i.e., glass, whitewares, refractories, and porcelain enamel) and advanced ceramics. Topics covered in the area of advanced ceramic include bioceramics, nanomaterials, composites, solid oxide fuel cells, mechanical properties and structural design, advanced ceramic coatings, ceramic armor, porous ceramics, and more.
Author: M. A. Meyers Publisher: Elsevier ISBN: 0080537235 Category : Technology & Engineering Languages : en Pages : 317
Book Description
The importance of the nanoscale effects has been recognized in materials research for over fifty years, but it is only recently that advanced characterization and fabrication methods are enabling scientists to build structures atom-by-atom or molecule-by molecule. The understanding and control of the nanostructure has been, to a large extent, made possible by new atomistic analysis and characterization methods pioneered by transmission electron microscopy. Nano and Microstructural Design of Advanced Materials focuses on the effective use of such advanced analysis and characterization techniques in the design of materials. Teaches effective use of advanced analysis and characterization methods at an atomistic level Contains many supporting examples of materials in which such design concepts have been successfully applied
Author: Fritz Appel Publisher: John Wiley & Sons ISBN: 352731525X Category : Technology & Engineering Languages : en Pages : 763
Book Description
The first book entirely dedicated to the topic emphasizes the relation between basic research and actual processing technologies. As such, it covers complex microstructures down to the nanometer scale, structure/property relationships and potential applications in key industries. From the contents: * Constitution * Thermophysical Constants * Phase Transformations and Microstructures * Deformation Behaviour * Strengthening Mechanisms * Creep * Fracture Behaviour * Fatigue * Oxidation Resistance and Related Issues * Alloy Design * Ingot Production and Component Casting * Powder Metallurgy * Wrought Processing * Joining * Surface Hardening * Applications and Component Assessment
Author: D. Hardwick
Author: D. Hardwick
Author: Alessandra Varone
Author: James C M Li
Author: Somnath Ghosh
Author: Antonio F. Caccavale
Author: Don E. Bray
Author: Susan Diane Hlavin Strothers
Author: Kumar Sridharan
Author: M. A. Meyers
Author: Fritz Appel