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precipitate-free zones

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Published: 30 June 2023
Fig. 9.21 Precipitate free zone (PFZ) in alloy 7075 sheet quenched in boiling water and aged 12 hours at 165 °C More
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Published: 01 June 2008
Fig. 9.12 Precipitate-free zone in an Al-Zn-Mg alloy. Source: Ref 6 More
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Published: 01 June 2008
Fig. 9.13 Precipitate-free zone (PFZ) width as a function of quench rate. Source: Ref 4 More
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Published: 01 March 2012
Fig. 16.17 Precipitate-free zone (PFZ) in an Al-Zn-Mg alloy. Source: Ref 16.10 as published in Ref 16.3 More
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Published: 01 March 2012
Fig. 16.18 Precipitate-free zone (PFZ) width as function of quench rate. Source: Ref 16.8 as published in Ref 16.3 More
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Published: 01 March 2012
Fig. 5.25 Scanning electron micrograph of continuous precipitation in 6061 aluminum alloy, where the smaller precipitates are Mg2Si, and the larger particles are AlFeSi intermetallics at the grain boundary. Note the precipitate-free zone near the AlFeSi intermetallics. Source: Ref 5.10 More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420339
EISBN: 978-1-62708-310-2
... is the activation energy for a transformation. Fig. 16.11 Transmission electron micrographs of precipitation sequence in aluminum-copper alloys. (a) Guinier-Preston zones at 720,000×. (b) θ″ at 63,000×. (c) θ′ at 18,000×. (d) θ at 8000×. Source: Ref 16.8 as published in Ref 16.2 Fig. 16.12 Free...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240135
EISBN: 978-1-62708-251-8
... because of the lattice coherency strains, as shown in Fig. 9.8 . The zones themselves are too small to be resolved, but the resulting strain fields can be resolved. Each step results in the previously precipitated phase being replaced with a new, more stable phase with a lower free energy. Fig. 9.7...
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Published: 01 December 2008
Fig. 8.22 (a, upper) The Laue diffraction image of Al-4%Cu alloy photographed by Preston ( Ref 20 , 22 ). (a, lower) the image of Guinier-Preston zone in the Al-Cu alloy from high-resolution electron microscopy ( Ref 23 ). (b, upper) The phase diagram and the free-energy diagram More
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Published: 01 March 2012
Fig. 16.9 (a) Gibbs free-energy composition diagram and (b) locus of solvus curves of metastable and stable equilibrium phases in a precipitation sequence. (a) The points of common tangency show the relationship between compositions of the matrix phase (C″, C′, and C eq ) and the various forms More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420087
EISBN: 978-1-62708-310-2
... boundary. Note the precipitate-free zone near the AlFeSi intermetallics. Source: Ref 5.10 as published in Ref 5.11 Fig. 5.26 Transmission electron micrograph showing a region of discontinuous (left) and continuous (right) precipitation in a specimen of AZ91 aged at 200 °C (390 °F) for 4 h...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2001
DOI: 10.31399/asm.tb.aub.t61170234
EISBN: 978-1-62708-297-6
... that the precipitation of these discrete particles of austenite at the grain and subgrain boundaries results in a nickel-depleted zone, which adversely affects the toughness and ductility of the molybdenum-free 18Ni(300) alloy on a localized scale. The precipitate particles are of a lattice size comparable...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.tm.t52320225
EISBN: 978-1-62708-357-7
..., and globular particles (Guinier-Preston zone) are formed by aging ( Ref 12 , 13 ). Fig. 8.14 The strain energy according to the precipitation of particles. (a) Electron microscope image of the structure of Al-5.5at.%Ag alloy thin film after aged at 433 K ( Ref 12 ). Globular particles dispersed...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930329
EISBN: 978-1-62708-359-1
... alloys in terms of grain boundary precipitation, grain growth, and hot cracking in the heat-affected zone; fusion zone segregation and porosity; and postweld heat treatments. Next, the article analyzes the welding characteristics of dissimilar and clad materials. This is followed by sections summarizing...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2006
DOI: 10.31399/asm.tb.ex2.t69980141
EISBN: 978-1-62708-342-3
... in the less-distorted zones of the crystal interiors, which can then be reached by atoms in the immediate neighborhood in spite of the lower mobility at these lower temperatures. The precipitates are then so fine that they cannot be detected under the microscope. If a suitable material is hardened...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.caaa.t67870063
EISBN: 978-1-62708-299-0
... in a 2 xxx alloy. Precipitation of the very high copper content precipitates on the boundary causes a copper-depleted zone on either side of the boundary. The difference in electrochemical potentials of the copper-depleted zone and the copper-rich matrix form a strong galvanic cell with a potential...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240053
EISBN: 978-1-62708-251-8
... , atoms of α initial must diffuse to the precipitate β; the rate of a precipitation reaction is almost always controlled by diffusion. In addition, the initial precipitate phase that forms (β in this example) is often not the final equilibrium phase. Metastable phases, which have a higher free energy...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030112
EISBN: 978-1-62708-282-2
... to that of properly annealed base metal because of: Microsegregation Precipitation of secondary phases Formation of unmixed zones Recrystallization and grain growth in the weld heat-affected zone (HAZ) Volatilization of alloying elements from the molten weld pool Contamination of the solidifying...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030070
EISBN: 978-1-62708-282-2
... treated temper (T3 or T4). If quenched too slowly, the alloy can be highly susceptible to IG corrosion. When poorly quenched, large Al-Cu(-Mg) precipitates form along the grain boundary. This produces a copper-depleted-zone along the boundaries, and a galvanic couple is then established. The copper...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930071
EISBN: 978-1-62708-359-1
.... Colloquially, these four defect types are known as hot cracks, heat-affected zone microfissures, cold cracks, and lamellar tearing. cold cracks fusion welding heat-affected zone hot cracks lamellar tearing welded assemblies THE FORMATION OF DEFECTS in materials that have been fusion welded...