Dynamic precipitation during cyclic deformation of an underaged Al–Cu alloy

Han, Wei‐Zhong; Chen, Yu; Vinogradov, Alexei; Hutchinson, Christopher

doi:10.1016/j.msea.2011.06.037

Cited by 68 publications

(28 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[37] Indeed, in the Al-Mg system, the nucleation of GP zones or metastable phases with a L1 0 or L1 2 structure and a Mg concentration of 25 at% (i.e., close to the local concentrations measured in the present investigations) have been reported in the literature. [29] However, it was shown that metastable intermetallic phases and GP zones in the Al-Mg system are unstable at room temperature or higher if the Mg content of the alloy is below 9 at%, [38][39][40][41] like in the present material. [29] However, it was shown that metastable intermetallic phases and GP zones in the Al-Mg system are unstable at room temperature or higher if the Mg content of the alloy is below 9 at%, [38][39][40][41] like in the present material.…”

Section: Mg Distribution In the Ufg Structure Resulting From Spdmentioning

confidence: 99%

Grain Boundary Segregation in UFG Alloys Processed by Severe Plastic Deformation

Sauvage¹,

Ганеев²,

Ivanisenko³

et al. 2012

Adv Eng Mater

View full text Add to dashboard Cite

One of the authors, Yu Ivanisenko, is thankful to DFG for funding support of a part of this investigation. The authors (A. Ganeev, R. Valiev, and M. Murashkin) are thankful to RFBR -11-08-91330 for partial support of the investigation.Grain boundary (GB) segregations were investigated by atom probe tomography in an Al-Mg alloy, a carbon steel and Armco 1 Fe processed by severe plastic deformation (SPD). In the non-deformed state, the GBs of the aluminum alloy are Mg depleted, but after SPD some local enrichment up to 20 at% was detected. In the Fe-based alloys, large carbon concentrations were also exhibited along GBs after SPD. These experimental observations are attributed to the specific structure of GBs often described as ''non-equilibrum'' in ultra fine grained materials processed by SPD. The GB segregation mechanisms are discussed and compared in the case of substitutional (Mg in fcc Al) and interstitial (C in bcc Fe) solute atoms. 968 wileyonlinelibrary.com ß

show abstract

Section: Mg Distribution In the Ufg Structure Resulting From Spdmentioning

confidence: 99%

Grain Boundary Segregation in UFG Alloys Processed by Severe Plastic Deformation

Sauvage¹,

Ганеев²,

Ivanisenko³

et al. 2012

Adv Eng Mater

View full text Add to dashboard Cite

show abstract

“…The vacancies are generated due to the formation of dislocation dipole loops which follows sequential events of jog dragging, thermal dissipation of vacancies and partial dislocation The cyclic hardening of Al-Mg-Si alloy in a relatively soft under-aging state is due to the presence of Guinier-Preston (GP) zones and Mg 2 Si particles (Figures 2d and 3b). Several authors [39,60,61] have suggested different mechanisms to explain the cyclic hardening in under-aged Al alloys during LCF, including the formation of GP zones [60], vacancy driven over-aging of GP zones [61] and dynamic strain aging [39]. Hence, it could be presumed that the cyclic hardening of the present alloy is a result of either cyclic strain-induced precipitation or the formation of particular dislocation structure caused by DSA as revealed by the serrated flow ( Figures 6 and 7).…”

Section: Fatigue Behaviourmentioning

confidence: 99%

“…It is also known that a large number of vacancies are generated by plastic deformation, which leads to the formation of GP zone. The vacancies are generated due to the formation of dislocation dipole loops which follows sequential events of jog dragging, thermal dissipation of vacancies and partial dislocation annihilation [60]. The formation of prismatic loops from elongated loops is caused by negative climb.…”

Section: Fatigue Behaviourmentioning

confidence: 99%

Cyclic Deformation Behavior of A Heat-Treated Die-Cast Al-Mg-Si-Based Aluminum Alloy

Mohammed

Gupta

et al. 2020

Materials

View full text Add to dashboard Cite

The purpose of this investigation was to study the low-cycle fatigue (LCF) behavior of a newly developed high-pressure die-cast (HPDC) Al-5.5Mg-2.5Si-0.6Mn-0.2Fe (AlMgSiMnFe) alloy. The effect of heat-treatment in comparison with its as-cast counterpart was also identified. The layered (α-Al + Mg2Si) eutectic structure plus a small amount of Al8(Fe,Mn)2Si phase in the as-cast condition became an in-situ Mg2Si particulate-reinforced aluminum composite with spherical Mg2Si particles uniformly distributed in the α-Al matrix after heat treatment. Due to the spheroidization of intermetallic phases including both Mg2Si and Al8(Fe,Mn)2Si, the ductility and hardening capacity increased while the yield stress (YS) and ultimate tensile strength (UTS) decreased. Portevin–Le Chatelier effect (or serrated flow) was observed in both tensile stress–strain curves and initial hysteresis loops during cyclic deformation because of dynamic strain aging caused by strong dislocation–precipitate interactions. The alloy exhibited cyclic hardening in both as-cast and heat-treated conditions when the applied total strain amplitude was above 0.4%, below which cyclic stabilization was sustained. The heat-treated alloy displayed a larger plastic strain amplitude and a lower stress amplitude at a given total strain amplitude, demonstrating a superior fatigue resistance in the LCF regime. A simple equation based on the stress amplitude of the first and mid-life cycles ((Δσ/2)first, (Δσ/2)mid) was proposed to characterize the degree of cyclic hardening/softening (D): D=±(Δσ/2)mid − (Δσ/2)first(Δσ/2)first, where the positive sign “+” represents cyclic hardening and the negative sign “−“ reflects cyclic softening.

show abstract

“…zone formation requires mass transfer and this depends on the presence of vacancies [29]. It can be readily shown that room temperature precipitation of G.P.…”

Section: Nature Aging Characteristic After Macmentioning

confidence: 99%

Severe plastic deformation-induced dissolution of θ" particles in Al–Cu binary alloy and subsequent nature aging behavior

Huang

Liu

Xia

et al. 2012

Materials Science and Engineering: A

View full text Add to dashboard Cite

Dynamic precipitation during cyclic deformation of an underaged Al–Cu alloy

Cited by 68 publications

References 29 publications

Grain Boundary Segregation in UFG Alloys Processed by Severe Plastic Deformation

Grain Boundary Segregation in UFG Alloys Processed by Severe Plastic Deformation

Cyclic Deformation Behavior of A Heat-Treated Die-Cast Al-Mg-Si-Based Aluminum Alloy

Severe plastic deformation-induced dissolution of θ" particles in Al–Cu binary alloy and subsequent nature aging behavior

Contact Info

Product

Resources

About