Crystal system of rod-shaped precipitates in an Al-1.0mass%Mg2Si-0.4mass%Si alloy

Matsuda, Kenji; Tada, Shizuo; Ikeno, Susumu; Sato, Tatsuo; Kamio, Akihiko

doi:10.1016/0956-716x(95)00121-b

Cited by 57 publications

(27 citation statements)

References 3 publications

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“…The precipitation sequence in the excess Si alloys was significantly different from those in the excess Mg and the quasibinary alloys as has been reported originally by Matsuda et al, [9][10][11][12] and various phases were also observed in the present study. In the alloy 6 aged at 210…”

Section: The Precipitation Of Intermediate Phases In the Excess Si Alsupporting

confidence: 75%

“…Cuboid β-Mg 2 Si particles 7,8) have been frequently observed in the alloys containing excess Mg atoms and also in the quasi-binary alloys. In the excess Si alloys, however, Matsuda et al reported that Type-A, B and C particles [9][10][11][12] form as well. The crystal structures of intermediate phases can be summarised as follows.…”

Section: Introductionmentioning

confidence: 99%

“…In the same temperature range where β rods form, Matsuda et al reported that Type-A, B and C rods form in excess Si alloys. [9][10][11][12] The structure of Type-A phase is hexagonal with a = 0.405 and c = 0.67 nm, that of Type-B is orthorhombic with a = 0.684, b = 0.793 and c = 0.405 nm, and Type-C phase has a hexagonal unit cell with a = 1.04 and c = 0.405 nm. * Graduate Student, Ehime University.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Excess Mg and Si on the Isothermal Ageing Behaviours in the Al-Mg<SUB>2</SUB>Si Alloys

et al. 2002

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The effects of excess Mg and Si contents on the isothermal ageing processes of Al-Mg 2 Si alloys have been investigated by means of transmission electron microscopy and the following results were obtained. After the formation of β needles inducing large age hardening, cuboid β particles precipitate in both the excess Mg and the quasi-binary alloys, but fine Si particles nucleate in the excess Si alloys. In the quasi-binary alloy, the following reaction is the precipitation of β rods and then β plates form. In the excess Si alloys, various rodlike precipitates form after the precipitation of β needles and Si particles in the sequence: Type-A rods→Type-B rods→ β rods. This precipitation sequence can be understood by considering the chemical compositions of them determined by Matsuda et al.

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Section: The Precipitation Of Intermediate Phases In the Excess Si Alsupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Excess Mg and Si on the Isothermal Ageing Behaviours in the Al-Mg<SUB>2</SUB>Si Alloys

et al. 2002

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“…12(a) and they can be indexed as Type-B precipitates determined by Matsuda et al [10][11][12][13] as shown in Fig. 12(b between Type-B rods and the matrix can be expressed as:…”

Section: This Relationship Is Rotatedmentioning

confidence: 99%

“…Westengen and Ryum 9) also observed similar cuboid particles and concluded that they are of equilibrium β-Mg 2 Si phase from the energy dispersive X-ray analysis. In the excess Si alloys, however, Matsuda et al [10][11][12][13] reported that a hexagonal Type-A phase with a = 0.405 and b = 0.670 nm, an orthorhombic Type B phase with a = 0.684, b = 0.793 and c = 0.405 and a hexagonal Type-C phase with a = 1.05 and b = 0.405 nm form. The precipitation of β and β phases has been studied extensively and various models for the crystal structures have been proposed, i.e., monoclinic structures for β needles, 12,[14][15][16][17][18][19]25) hexagonal structures for β rods.…”

Section: Introductionmentioning

confidence: 99%

Ageing Processes in Al-Mg-Si Alloys during Continuous Heating

Ohmori¹,

Doan²,

Nakai³

2002

Mater. Trans.

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The precipitation behaviours during continuous heating in the Al-Mg 2 Si alloys with excess Mg and Si contents have been investigated by means of Vickers hardness measurements, differential scanning calorimetry and transmission electron microscopy. The first exothermic reaction occurring at the lowest temperatures is due to the annihilation of quenched-in vacancies by the collapse of vacancy clusters and the migration of vacancies to various sinks such as grain boundaries. The prismatic dislocation loops formed by this collapse are frequently observed. The second reaction detected as broad hardening increases with increasing excess Si content and can be interpreted as the formation of solute atom clusters. The sharp and large exothermic reaction inducing the largest hardening corresponds to the precipitation of β needles. The following exothermic reaction arises from the precipitation of β-Mg 2 Si particles. The formation of β and Type-B rods can be recognised in the quasi-binary and the excess Si at slightly higher temperatures.

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Atomic Structures of Precipitates in Al–Mg–Si Alloys with Small Additions of Other Elements

et al. 2018

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In Al–Mg–Si alloys, additions of only a few weight percent of Mg and Si enable formation of hardening precipitates during heat treatment. The precipitation is complex and is influenced by chemical compositions and thermo‐mechanical treatment. Structural analysis at the atomic scale has played an important role for understanding the Al–Mg–Si system. This review paper gives a summary of the influence of elements on the precipitate structures of Al–Mg–Si alloys at the atomic scale. The structures are modified by small additions of different elements, but all the encountered precipitates are structurally connected with the Si network, except for the main hardening phase which exhibit a partially discontinuous Si network. The influence of the selected elements (Li, Cu, Zn, Ge, Ag, Ni, Co, and Au) is discussed in detail.

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Crystal system of rod-shaped precipitates in an Al-1.0mass%Mg2Si-0.4mass%Si alloy

Cited by 57 publications

References 3 publications

Effects of Excess Mg and Si on the Isothermal Ageing Behaviours in the Al-Mg<SUB>2</SUB>Si Alloys

Effects of Excess Mg and Si on the Isothermal Ageing Behaviours in the Al-Mg<SUB>2</SUB>Si Alloys

Ageing Processes in Al-Mg-Si Alloys during Continuous Heating

Atomic Structures of Precipitates in Al–Mg–Si Alloys with Small Additions of Other Elements

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