Effect of Zn additions on the age-hardening of Mg–2.0Gd–1.2Y–0.2Zr alloys

Honma, T.; Ohkubo, T.; Kamado, Shigeharu; Hono, K.

doi:10.1016/j.actamat.2007.02.036

Cited by 463 publications

(175 citation statements)

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“…8) In the course of the investigation of microstructures in an Mg 97 Gd 2 Zn 1 (at%) alloy aged at 200 C, we have found GPzones being coexistent with the 0 and 1 precipitates that have been found in Mg-RE alloys. [9][10][11] This study is to determine the structure of the GP-zones by the combination of HRTEM and HAADF-STEM. In particular, HAADF-STEM has been shown to be a powerful tool for the investigation of fine phases precipitated coherently to the matrix and for direct observations of heavy atoms segregated from solid solutions.…”

Section: Introductionmentioning

confidence: 99%

The Structure of Guinier-Preston Zones in an Mg-2 at%Gd-1 at%Zn Alloy Studied by Transmission Electron Microscopy

et al. 2008

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Planar Guinier-Preston zones (GP-zones) parallel to a basal plane of an Mg hexagonal lattice are found together with 0 and 1 precipitates, which have been found in Mg-Gd alloys, in an Mg-2 at%Gd-1 at%Zn (Mg 97 Gd 2 Zn 1 ) alloy aged at 200 C for 150 hrs. From the combination of high-resolution transmission electron microscopy (HRTEM) and high-angle annular detector dark field scanning transmission electron microscopy (HAADF-STEM), we can determine the structure of the GP-zone, in which Gd and/or Zn atoms occupy at ordered positions in two close-packed planes sandwiching a close-packed plane of Mg atoms.

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Section: Introductionmentioning

confidence: 99%

The Structure of Guinier-Preston Zones in an Mg-2 at%Gd-1 at%Zn Alloy Studied by Transmission Electron Microscopy

et al. 2008

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“…[9] Its structure was identified as an orthorhombic (bco, a=2×a Mg =0.640nm, b=8×d Mg =2.223nm, c= c Mg =0.521nm), and the composition was rich in rare earth elements. [9,25,26] As seen in the image, the fine spheroidal β′ precipitates, whose diameter ranged between 5-40nm, were evenly dispersed in the matrix. [ Fig.…”

Section: Initial Microstructurementioning

confidence: 99%

Creep and Fracture Behavior of Peak-Aged Mg-11Y-5Gd-2Zn-0.5Zr (wt pct)

Yin

Wang

Boehlert

et al. 2012

Metall Mater Trans A

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The tensile-creep and creep-rupture behavior of heat-resistant peak-aged Mg-11Y-5Gd-2Zn-0.5Zr (wt.%) (WGZ1152) was investigated at T=523-598K (0.58-0.66T m ) and stresses between 30MPa to 140MPa. The minimum creep rate of the alloy was almost two orders of magnitude lower than that for WE54-T6, and was comparable to that for HZ32-T5. The creep behavior exhibited an extended tertiary creep stage, which was believed to be associated with precipitate coarsening. The creep stress exponent value was 4.5, suggesting that dislocation creep was the rate-controlling mechanism. The activation energy for creep (221±20kJ/mol) was higher than that for self-diffusion in magnesium, and was believed to be associated with the activation of non-basal slip and cross slip. This was consistent with the surface deformation observations, which revealed a transition from basal slip to non-basal slip and cross slip with increasing temperature. The minimum creep rate and rupture time followed the original and modified Monkman-Grant relationships. The microcracks and cavities preferentially nucleated at grain boundaries and at the interface between Mg matrix and the second phase. In-situ creep experiments highlighted the intergranular cracking evolution.

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“…Although the addition of Zn degrades the age-hardening response, it causes the discontinuous precipitation of a 14H-type long-period stacking (LPS) phase at grain boundaries as well as within grains in the over-aged condition, which enhances the maximum tensile elongation. The composition of the β1 phase was determined to be Mg-23.3at.% RE-9.7at.% Zn-2.0at.% Zr (RE: rareearth, Gd and Y), whereas that of the LPS is Mg-5.6at.% RE-1.8at.% Zn-1.0at.% Zr [51].…”

Section: Effect Of Zn Additions On the Age-hardening Of Mg-20gd-12ymentioning

confidence: 99%

Review of recent studies in Magnesium matrix composites

2017

IJMTER

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Abstract-Metal matrix composites offer a wide range of opportunities for many structure applications because of their improved physical, chemical, thermal and mechanical properties in comparison with their monolithic metal counterparts. Light alloys reinforced with short fibres or particles allow adapting more exactly the work piece material properties to tailor made requirements. There is an increasing trend in the automotive industry to use these materials for various components. In this paper, recent progress in magnesium matrix composite processing technologies are reviewed. The various particle addition to magnesium matrix and its effect on composites are reported. the changes in mechanical properties due to incorporation of particles are elaborated. some composite microstructures are subsequently discussed with respect to grain refinement, reinforcement distribution, and interfacial characteristics. The tribological properties of the magnesium matrix composites are also reported.

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Effect of Zn additions on the age-hardening of Mg–2.0Gd–1.2Y–0.2Zr alloys

Cited by 463 publications

References 28 publications

The Structure of Guinier-Preston Zones in an Mg-2 at%Gd-1 at%Zn Alloy Studied by Transmission Electron Microscopy

The Structure of Guinier-Preston Zones in an Mg-2 at%Gd-1 at%Zn Alloy Studied by Transmission Electron Microscopy

Creep and Fracture Behavior of Peak-Aged Mg-11Y-5Gd-2Zn-0.5Zr (wt pct)

Review of recent studies in Magnesium matrix composites

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