Changes in Microstructures of Al-5, 10 mass%Mg Binary Alloys with Aging Treatment

Nakayama, Yoshihiro; Takaai, Tetsuya; Jin, Dazhou; Yamada, Yuuji

doi:10.2320/jinstmet1952.61.1_34

Cited by 6 publications

(6 citation statements)

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“…Also, at ageing temperatures above 200°C, i. e., at 230°C [9] and at 300°C [8,21], the same conclusion has been obtained in this alloy.…”

Section: Precipitation At Grain Boundariessupporting

confidence: 81%

“…7, on the other hand, show that precipitation took place most rapidly at 225°C. Nakayama et al [21], who measured the resistivity of an Al-9 wt.% Mg alloy quenched from 400°C and aged at temperatures between 100 and 300°C, came to the same conclusion.…”

Section: Effect Of Ageing Temperaturesupporting

confidence: 51%

“…4 and 5), have been identified by Fink and Smith [8], and also by Nakayama et al [21] as the stable b-phase.…”

Section: (5) Ageing At Temperatures Above 275°cmentioning

confidence: 92%

“…In contrast, precipitation at ageing temperatures above 200°C has been studied less systematically [9,10,16,21]. Although it has been found that both precipitation at the grain boundaries and precipitation within the grains are greatly accelerated at these high ageing temperatures, the results are semi-quantitative.…”

Section: Introductionmentioning

confidence: 88%

“…% Mg alloy [9,11], but also in the Al-7 wt.% Mg alloy [10] and in the Al-8.5 wt.% Mg alloy [17], rod [10,11] or plate-like [9,17,21] precipitates were formed during ageing at temperatures below 200°C. These precipitates were aligned parallel to the <100> directions [11], or along the {100} and {210} planes [9], or along the {100} to {310} planes [17], or along the {100} planes and planes having the <100> zone axis [16], yielding typical Wid-mannstätten structures associated with precipitation free zones [10].…”

Section: Precipitation Within Grainsmentioning

confidence: 99%

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Precipitation of the β-phase in Al–Mg alloys

Inagaki¹

2005

MEKU

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Precipitation of the b-phase in Al-Mg alloysIn order to clarify the effects of the ageing temperature and the Mg content on precipitation of the b'and b-phases in Al -Mg alloys, Al-6, 7, 8 and 9 wt.% Mg alloys were solution treated either at 450°C and isothermally aged at temperatures between 150 and 325°C. Precipitation of these phases was investigated in detail by optical microscopy and by the measurements of electrical conductivity and micro-Vickers hardness. It was found that, in these alloys, nucleation of precipitates occurred much more rapidly at grain boundaries than within the grains at all ageing temperatures. It was always after grain boundary precipitation had completed that precipitation within the grains began to take place. Time Temperature Transformation curves were therefore constructed both for grain boundary precipitation and for precipitation within the grains. These TTT curves showed that, in all cases, both types of precipitation occurred most rapidly at ageing temperatures between 250 and 275°C. At ageing temperatures above these nose temperatures, precipitation occurred mainly by rapid growth of a limited number of precipitates, whereas at ageing temperatures below these nose temperatures, precipitation took place by the nucleation of numerous fine precipitates and by their subsequent slow growth. The increase in the Mg content not only accelerated precipitation, but also it increased the amount of precipitation within the grains.

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