The Aging Characteristics of Magnesium-4wt% Zinc Alloy

Mima, Genjiro; Tanaka, Yasuzô

doi:10.2320/matertrans1960.12.71

Cited by 57 publications

(26 citation statements)

References 6 publications

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“…Addition of Cu also increases the eutectic temperature and permits the use of higher solution treatment temperatures. [2,3] The precipitation sequence in the Cu-containing Mg-Zn alloys above 150°C [4] has been reported to be the same as the most probable aging sequence for a binary Mg-Zn alloy: [5][6][7][8][9][10][11][12] SSSS ! solute clusters !…”

Section: Introductionmentioning

confidence: 98%

“…[14] The precipitation of GP zones was also confirmed by the effect that low-temperature preaging had on hardness and microstructure evolution during subsequent artificial aging. [7,8,15] A more recent study showed that the precipitation in Mg-Zn alloy commences by clustering of Zn atoms, while during aging at intermediate temperatures (up to about 100°C), four to six different types of precipitates were simultaneously present in the microstructure leading to hardening of a significant magnitude. [16] Age hardening at ambient temperature after quenching from the solution heat treatment temperature is common to age-hardenable aluminum alloys; however, this was not observed in age-hardenable magnesium alloys in the past.…”

Section: Introductionmentioning

confidence: 99%

“…[16] Age hardening at ambient temperature after quenching from the solution heat treatment temperature is common to age-hardenable aluminum alloys; however, this was not observed in age-hardenable magnesium alloys in the past. [5,7] This led to an assumption that magnesium alloys do not undergo natural aging and that the interactions between the solute elements and vacancies in these alloys are weak. On the other hand, for some aluminum alloys (e.g., Al-Cu-Li-Ag-Mg-Zr), the mechanical properties achieved by natural aging can reach those of the artificially aged material; [17] for some Al-Zn-Mg (7000 series) and Al-Cu-Mg (2000 series) based alloys, natural aging prior to artificial aging may, in some cases, be beneficial to the mechanical properties of the artificially aged material.…”

Section: Introductionmentioning

confidence: 99%

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Natural Aging in Mg-Zn(-Cu) Alloys

Buha

Ohkubo

2008

Metall Mater Trans A

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Natural aging in Mg-Zn-Cu alloys results in a significant hardening due to the formation of a high number density of shearable precipitates. For alloys containing Zn and Cu in the compositional ranges of both cast and wrought alloys (Zn = 2 to 2.4 at. pct, and Cu = 0.15 to 1.2 at. pct), hardening produced by natural aging (T4) for 4 to 8 weeks (91 to 104 VHN) almost equals that produced by artificial aging (93 to 109 VHN). The density of the precipitates in the T4 condition of Mg-Zn-Cu alloys was found to be of the order of precipitate density in a typical aged aluminum alloy (10 24 precipitates/m 3 ). An addition of even a trace amount of Cu to Mg-Zn alloy enhances the nucleation of the precipitates and accelerates the kinetics of precipitation, in particular during natural aging. This is believed to be a result of the enhanced favorable interaction between Cu, Zn, and vacancies. The strengthening is produced mainly by the formation of a very high density of the coherent disc-shaped Guinier-Preston 1 (GP1) zones and the prismatic precipitates perpendicular to the magnesium basal plane.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Natural Aging in Mg-Zn(-Cu) Alloys

Buha

Ohkubo

2008

Metall Mater Trans A

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“…[52][53][54][55][56] The aging curves of two binary Mg-Zn alloys are provided in Figure 5(a). Depending on the alloy composition and aging temperatures, it is commonly accepted in the literature [6,8,30] that the decomposition of the supersaturated solid-solution matrix phase reportedly involves the formation of G.P.…”

Section: Phase Equilibria and Precipitationmentioning

confidence: 99%

Precipitation and Hardening in Magnesium Alloys

Nie

2012

Metall Mater Trans A

1,394

519

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Magnesium alloys have received an increasing interest in the past 12 years for potential applications in the automotive, aircraft, aerospace, and electronic industries. Many of these alloys are strong because of solid-state precipitates that are produced by an age-hardening process. Although some strength improvements of existing magnesium alloys have been made and some novel alloys with improved strength have been developed, the strength level that has been achieved so far is still substantially lower than that obtained in counterpart aluminum alloys. Further improvements in the alloy strength require a better understanding of the structure, morphology, orientation of precipitates, effects of precipitate morphology, and orientation on the strengthening and microstructural factors that are important in controlling the nucleation and growth of these precipitates. In this review, precipitation in most precipitation-hardenable magnesium alloys is reviewed, and its relationship with strengthening is examined. It is demonstrated that the precipitation phenomena in these alloys, especially in the very early stage of the precipitation process, are still far from being well understood, and many fundamental issues remain unsolved even after some extensive and concerted efforts made in the past 12 years. The challenges associated with precipitation hardening and age hardening are identified and discussed, and guidelines are outlined for the rational design and development of higher strength, and ultimately ultrahigh strength, magnesium alloys via precipitation hardening.

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“…[10][11][12][13][14][15][16][17] For example, Mg-5 mass%Zn alloy exhibits age hardening by the precipitation of needle shaped MgZn phase after prolonged aging at $422 K. 10) To date, however, TMT to attain microstructural stability has not been investigated in magnesium alloys.…”

Section: Introductionmentioning

confidence: 99%

Materials Processing for Structural Stability in a ZK60 Magnesium Alloy

et al. 2003

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The materials processing, consisted of a four step process of solution treatment, pre-strain, overaging and hot working, was developed for attaining structural stability at high temperatures in a commercial Mg-Zn-Zr alloy, ZK60. The grain size of the material processed by this schedule was refined to 2.5 mm, and the material behaved in a superplastic manner at 548 K and at a strain rate of 1 Â 10 À2 s À1 owing to the grain size stability at this temperature. From the analysis of the chemical composition of precipitates, it was suggested that the phase Mg 7 (Zn,Zr) 3 , which was not observed in material without pre-strain, was effective in pinning the grain boundaries at high temperatures.

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The Aging Characteristics of Magnesium-4wt% Zinc Alloy

Cited by 57 publications

References 6 publications

Natural Aging in Mg-Zn(-Cu) Alloys

Natural Aging in Mg-Zn(-Cu) Alloys

Precipitation and Hardening in Magnesium Alloys

Materials Processing for Structural Stability in a ZK60 Magnesium Alloy

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