Precipitated Structures and Mechanical Properties of AZ91D Magnesium Alloy

Ishikawa, Keisuke; Kobayashi, Yasuo; Kaneko, Toshiaki; Shibusawa, Toshinori

doi:10.2320/jinstmet1952.61.10_1031

Cited by 11 publications

(2 citation statements)

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“…17. As reported in the literature, [25][26][27] the hardness of precipitated cells was independent of aging time and decreased with an increase in aging temperature. In found in a specimen aged for 1 h (3.6 ks) at 210 C (483 K) and analyzed for chemical composition.…”

Section: Age Hardening Responsesupporting

confidence: 58%

Effects of Solute Segregation on Precipitation Phenomena and Age Hardening Response of High-Purity and Commercial AZ91 Magnesium Alloys

et al. 2009

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In the present study, the continuous and discontinuous precipitation behavior of the commercial AZ91 alloy containing manganese and the AZ91 alloy produced from high-purity elemental components with no manganese addition has been investigated. It was found that for the commercial alloy, the solute manganese segregated within the primary -Mg dendrites during solidification and played a major role in the initiation of non-uniform distribution of -precipitates within the matrix grains. In addition, the solute manganese significantly suppressed the growth of discontinuous (lamellar) precipitates. The high-purity alloy also exhibited non-uniform precipitation. However, the precipitation patterns differed from those observed in the commercial alloy due to the inhomogeneous distribution of aluminum, the origin of which was rooted in the solute segregation within the interdendritic regions of the solidification structure. These differences in the precipitation mode caused by the presence or absence of manganese influenced the age hardening of the alloys. The high-purity specimens aged at lower temperatures attained higher peak-hardness owing to greater area fractions of discontinuous precipitation cells.

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Section: Age Hardening Responsesupporting

confidence: 58%

Effects of Solute Segregation on Precipitation Phenomena and Age Hardening Response of High-Purity and Commercial AZ91 Magnesium Alloys

et al. 2009

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“…Furthermore, there is a need to diminish pore dimensions as this would add functionality (e.g., the ability to filter smaller particles) and allow miniaturization of devices such as heat exchangers in microsystems. Here, we show a new nanoporous superalloy membrane, far surpassing existing gas permeable porous metals [5,13,14] in fineness and regularity of the porosity. The porosity, consisting of regularly spaced ªchannelsº a few hundred nanometers wide, is so fine that not even bacteria can pass through.…”

mentioning

confidence: 99%

Fatigue‐Life Prediction of Magnesium Alloys for Structural Applications

et al. 2003

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Compared with other metallic materials, magnesium alloys have a higher tendency to creep. Therefore, the connection of magnesium components to adjacent assemblies (e.g., in bolted fastenings) has an important meaning. [6] The influence of the prestress of the screws with regard to varying contact conditions and coefficients of friction can be investigated by the finite element method as shown in Figure 7. The results must be verified by experiments.Further investigations will be carried out to determine the structural durability of cast components, e.g., experiments with variable-amplitude loading and experiments based on real load-time histories. In cooperation with the project partners, sub-projects have been defined in order to determine necessary characteristic values with regard to the fatigue behavior, to develop numerical and assessment procedures, etc. The aim of the project is to give recommendations for the use of magnesium alloys.

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