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The theory of transformations in metals and alloys
J.W. Christian,H. M. Otte +1 more
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TLDR
In this paper, the authors present a general introduction to the theory of transformation kinetics of real metals, including the formation and evolution of martensitic transformations, as well as a theory of dislocations.Abstract:
Part I General introduction. Formal geometry of crystal lattices. The theory of reaction rates. The thermodynamics of irreversable processes. The structure of real metals. Solids solutions. The theory of dislocations. Polycrystalline aggregates. Diffusion in the solid state. The classical theory of nucleation. Theory of thermally activated growth. Formal theory of transformation kinetics. Part II Growth from the vapour phase. Solidification and melting. Polymorphic Changes. Precipitation from supersaturated solid solution. Eutectoidal transformations. Order-disorder transformations. Recovery recrystalisation and grain growth. Deformation twinning. Characteristics of martensic transformations. Crystallography of martensitic transformations. Kinetics of martensitic transformations. Rapid solidification. Bainite steels. Shape memory alloys.read more
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An experimental and theoretical investigation of the formation of Zr-containing dispersoids in Al–4.5Zn–1Mg aluminum alloy
TL;DR: In this article, the formation of Zr-containing dispersoids during the homogenization treatment of AA7020 aluminium alloy with different Zr contents was investigated and an optimum treatment was proposed on the basis of the results of modelling in terms of Zener drag pressure and verified on the alloy after hot compression testing and annealing.
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Friction stir welding of precipitation strengthened aluminium alloys: scope and challenges
P.S. De,Rajiv S. Mishra +1 more
TL;DR: In this article, low intensity post-weld plastic deformation and design of dispersion containing aluminium alloys are suggested as approaches to enhance joint efficiency in friction stir welded structures.
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Crystallization kinetics and spectroscopic investigations on Tb3+ and Yb3+ codoped glass ceramics containing CaF2 nanocrystals
Lihui Huang,Guanshi Qin,Yusuke Arai,Rajan Jose,Takenobu Suzuki,Yasutake Ohishi,Tatsuya Yamashita,Yusuke Akimoto +7 more
TL;DR: The average apparent activation energy of the crystallization was ∼498kJ∕mol and the value of the Avrami exponent n was 1.01 as mentioned in this paper, which suggests that the crystallisation mechanism of CaF2 is a diffusion controlled growth process of needles and plates of finite long dimensions.
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The Morphology and Mechanical Properties of Bainite Formed from Deformed Austenite
R. H. Edwards,N. F. Kennon +1 more
TL;DR: This article showed that deformed austenite transforms to upper bainite at temperatures at least as low as 200°C due to enhanced nucleation and/or growth at slip band heterogeneities generated by the defor-mation process.
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Twinning in γ′ Cu–Al–Ni Martensite with Cu 3 Ti Type Ordered Structure
Kazuhiro Otsuka,Ken’ichi Shimizu +1 more
TL;DR: In this article, the authors analyzed the deformation twinning in γ'Cu-Al-Ni martensite with Cu3Ti type ordered structure, whose sublattice is HCP, and the following conclusions were reached: (1) The twinning elements of {121}γ'and{101}γ'twinnings consistent with the phenomenological theory are as follows.