Work-softening and anneal-hardening behaviors in fine-grained Zn–Al alloys

Yang, Chao-Fu; Pan, Jiun-Hung; Lee, Te‐Hao

doi:10.1016/j.jallcom.2008.01.067

Cited by 42 publications

(21 citation statements)

References 5 publications

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“…Third, in metals with low melting temperatures such as Zn, Pb, Sn and In, the hardness slightly decreases with an increase in strain at an early stage of straining and enters into a steady state at large strains [29,38]. This strain softening behavior was also reported in nanograined Ni [12,13] as we all as in several alloys such as a Pb-Sn eutectic alloy [39], a Zn-Al-Cu alloy [40], Zn-Al monotectoid alloys [39][40][41][42] and Al-Zn alloys [43][44][45][46][47][48][49][50][51].…”

Section: Introductionsupporting

confidence: 61%

Softening by severe plastic deformation and hardening by annealing of aluminum–zinc alloy: Significance of elemental and spinodal decompositions

Alhamidi

Edalati

Horita

et al. 2014

Materials Science and Engineering: A

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An Al-30 mol.% Zn supersaturated solid solution alloy was severely deformed using highpressure torsion (HPT) at 300 K and subsequently annealed at 373-673 K. The hardness and tensile strength significantly decreased and the tensile ductility increased with straining by HPT and reached a steady-state level at large imposed strains. Despite this softening behavior, the lattice strain was increased, Zn-rich particles were precipitated and the initial coarse grains were refined significantly to a size of ~190 nm while being accompanied by decomposition to Al-and Zn-rich phases because of rapid atomic diffusion. The subsequent annealing led to a hardening, but microstructural observations showed that decrease in the lattice strain, increase in the grain size and reduction in the fraction of precipitates occurred by annealing. It was shown that the unusual softening/hardening behavior of the Al-Zn alloy was mainly due to the contribution of spinodal decomposition. The formation of nano-sized lamellae by spinodal decomposition resulted in increase in hardness after solution treatment and after post-HPT annealing, while this lamellar structure was destroyed by HPT which resulted in softening. The softening was less significant when the hardness was evaluated at low homologous temperatures.

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Section: Introductionsupporting

confidence: 61%

Softening by severe plastic deformation and hardening by annealing of aluminum–zinc alloy: Significance of elemental and spinodal decompositions

Alhamidi

Edalati

Horita

et al. 2014

Materials Science and Engineering: A

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“…However, in the present case, no apparent grain elongation due to the plastic deformation are seen in the microstructure of ECAPed Zn-0.3Al alloy. Because recrystallization temperature of Zn grains is about À 12°C [29] and thus the deformed grains dynamically recrystallizes easily and rapidly even at RT during ECAP. Thus, all grains in that microstructure appear to be free of dislocations, and the grain boundaries are reasonably smooth after ECAP ( Fig.…”

Section: Microstructurementioning

confidence: 99%

Effect of equal-channel angular pressing on room temperature superplasticity of quasi-single phase Zn–0.3Al alloy

Demirtas

Pürçek

Yanar

et al. 2015

Materials Science and Engineering: A

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“…Hence, uniformity of the as-cast microstructure is the key point for improving the deformation abilities of the ZA alloys. As is known, both work-softening and anneal-hardening are special characteristics of ZA alloys [9][10][11][12], which are mostly attributed to the complicated microstructures under equilibrium and metastable states, by various phases transformation including eutectic, eutectoid, peritectic reactions, etc. [13,14].…”

Section: Microstructure Characteristics Of As-cast Zn-16al Alloy Durimentioning

confidence: 99%

“…[13,14]. According to the previous investigations [12,14], homogenization always to be the best choice for microstructure uniformity, but something new should be tried.…”

Section: Microstructure Characteristics Of As-cast Zn-16al Alloy Durimentioning

confidence: 99%

“…According to literatures [9][10][11][12][13][14], and comprehensively analyze the distribution regularities and the precipitation characteristics of this phase, the formation mechanism can be proposed. Considering the kinetic theory, atomic diffusion, and phase transformation characteristics, the precipitation of the g phase is attributed to the interaction made by the following factors.…”

Section: Formation Mechanism Of Needle-shaped G Phasementioning

confidence: 99%

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Microstructure Characteristics of As-Cast Zn-16Al Alloy during Homogenization Treatment

Lin

Lei

Zhang

et al. 2013

Materials and Manufacturing Processes

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Homogenization treatment of as-cast Zn-16Al alloy was investigated. Effects of various parameters on the microstructure transformation and the mechanical properties were researched with the methods of hardness test, tensile test, scanning electron microscopy analysis, etc. The results indicate that 360 C Â 8 h with furnace cooling is the most reasonable homogenization process for Zn-16Al alloy. Additionally, a new kind of needle-shaped or shuttle-shaped g phase is observed during the furnace-cooled homogenization, which exhibits an extremely regular distribution with an included angle of 120 and a location between the lamellar eutectoids (a þ g). The formation of the new g phase is mainly attributed to the Al-depleted-zones left behind by the decomposition of supersaturated a phase. The a 0 phase precipitating from eutectoid reaction a ! a 0 þ g contains a much higher Al-content than that of original a phase.

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Work-softening and anneal-hardening behaviors in fine-grained Zn–Al alloys

Cited by 42 publications

References 5 publications

Softening by severe plastic deformation and hardening by annealing of aluminum–zinc alloy: Significance of elemental and spinodal decompositions

Softening by severe plastic deformation and hardening by annealing of aluminum–zinc alloy: Significance of elemental and spinodal decompositions

Effect of equal-channel angular pressing on room temperature superplasticity of quasi-single phase Zn–0.3Al alloy

Microstructure Characteristics of As-Cast Zn-16Al Alloy during Homogenization Treatment

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