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coherent precipitates

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Published: 01 June 2016
Fig. 28 Schematic of coherent structure of solute-rich precipitates region that causes lattice strain More
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Published: 01 June 2016
Fig. 40 Coherent transition precipitates revealed by strain contrast (dark-field) in transmission electron microscopy. The specimen is a Cu-3.1Co alloy aged 24 h at 650 °C (1200 °F). The precipitate is a metastable face-centered cubic (fcc) phase of virtually pure cobalt in the fcc matrix More
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Published: 01 December 2004
Fig. 13 Schematic of coherent structure of solute-rich precipitates region that causes lattice strain (indicated schematically by dashed lines) More
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Published: 01 December 2004
Fig. 12 Coherent transition precipitates revealed by strain contrast (dark-field) in transmission electron microscopy. The specimen is a Cu-3.1Co alloy aged 24 h at 650 °C (1200 °F). The precipitate is a metastable face-centered cubic (fcc) phase of virtually pure cobalt in the fcc matrix More
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Published: 15 December 2019
Fig. 35 Diffraction pattern from a specimen of shock-loaded Nitronic 40. The streaking is due to precipitation of a coherent second phase and deformation-induced twinning. The shape of the coherent precipitates and the elastic strain they induce caused streaking of the precipitate diffraction More
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Published: 01 January 1986
Fig. 16 Diffraction pattern from a specimen of shock-loaded Nitronic 40. The streaking is due to precipitation of a coherent second phase and deformation-induced twinning. The shape of the coherent precipitates and the elastic strain they induce has caused streaking of the precipitate More
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Published: 27 April 2016
Fig. 17 Coherent (left) and noncoherent (right) precipitation. (a) and (b) A coherent or continuous structure forms when any precipitate is very small. (c) and (d) Coherency is lost after the particle reaches a certain size and forms its own crystal structure. Then a real grain develops More
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003731
EISBN: 978-1-62708-177-1
... Abstract Precipitation reactions occur in many different alloy systems when one phase transforms into a mixed-phase system as a result of cooling from high temperatures. This article discusses the homogenous and heterogeneous nucleation and growth of coherent and semicoherent precipitates...
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Published: 01 June 2016
Fig. 29 Loss of coherency of γ″ precipitates in alloy 718. q, aspect ratio; e, disk particle thickness; L, mean equivalent diameter of disk-shaped particle. Source: Ref 34 More
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006250
EISBN: 978-1-62708-169-6
... Abstract This article introduces the mechanism of diffusion and the common types of heat treatments such as annealing and precipitation hardening, which are applicable to most ferrous and nonferrous systems. Three distinct processes occur during annealing: recovery, recrystallization, and grain...
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006509
EISBN: 978-1-62708-207-5
... of precipitation hardening include: Aluminum-copper systems with hardening from coherent precipitation of Guinier-Preston (GP) zones and subsequent transition precipitates (θ″ and θ′), which ultimately soften with the equilibrium phase CuAl 2 (θ) Aluminum-copper-magnesium systems, where magnesium...
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Published: 30 November 2018
Fig. 14 Aging sequence in 7050. (a) Initial Guinier-Preston (GP) zone formation. (b) GP zone present and formation of semiincoherent η′. (c) Semiincoherent η′ and formation of coherent equilibrium precipitate η. (d) Precipitation of equilibrium precipitate η. Source: Ref 5 More
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Published: 01 June 2016
Fig. 32 Aging sequence in 7050. (a) Initial Guinier-Preston (GP) zone formation. (b) GP zone present and formation of semi-incoherent η′. (c) Semi-incoherent η′ and formation of coherent equilibrium precipitate η. (d) Precipitation of equilibrium precipitate η. Source: Ref 57 More
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006287
EISBN: 978-1-62708-169-6
... aluminum alloys include: Aluminum-copper systems, with strengthening from coherent and transition precipitates prior to the formation of the equilibrium intermetallic CuAl 2 (2 xxx and 2 xx.x alloy series) Al-Cu-Mg systems, in which magnesium intensifies precipitation hardening with CuAl 2...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006274
EISBN: 978-1-62708-169-6
.... If this step is done properly, the precipitates can result in significant hardening of the alloy. In some cases, the precipitates are even coherent with the crystal matrix of the parent metal (see also the article “Principles of Heat Treating of Nonferrous Alloys” in this Volume). Although the aging process...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006268
EISBN: 978-1-62708-169-6
... of reversion, duplex annealing, and retrogression and re-aging are included. age hardening aging alloying aluminum alloys coherent precipitates precipitate-free zones semi-coherent precipitates ternary phase diagrams AGE HARDENING (or just aging) is the final step of the entire hardening...
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Published: 31 December 2017
Fig. 12 (a) Ashby and (b) Orowan models for interaction of dislocations with coherent and incoherent precipitates More
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Published: 01 December 2004
.). Polarized light and sensitive tint bring out the diffuse crisscross markings due to the submicroscopic γ′ precipitates and coherency strain fields. The magnification bar is 50 μm long. (b) Tint etching with Klemm's I did not reveal the structure as well, although the grain size is revealed. Tint etchants More
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Published: 01 January 1996
°F) plus 8 h at 550 °C (1020 °F), coherent NiAl and copper precipitates are present. There is very little cyclic softening for this treatment. The cycles to fatigue crack initiation in a notched specimen were more than ten times greater for the latter treatment at a nominal stress amplitude of 196 MN More
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Published: 01 August 2013
Fig. 19 Vanadium-nitride precipitate (rocksalt-type crystal structure) in an α-Fe (body-centered cubic, or bcc) matrix (high-resolution transmission electron microscopy). At the top right corner, crystallographic directions referring to the bcc lattice of the α-Fe matrix are shown. The set More