Sangwon Lee
,
Bonggyu Park
,
Yongho Park
,
Ikmin Park
材料科学技术（英）
The effect of Sn addition on the microstructures and mechanical properties of Mg-5Al-2Si alloys was investigated with variations of Sn contents (3 and 6 wt pct). The microstructure of the alloy was characterized by the presence of Mg2Sn particles within matrix and at grain boundaries. As the Sn contents increased, yield and ultimate tensile strength were increased at room temperatures and 150℃. Creep properties were improved with the increasing amount of Sn due to the fine precipitation of Mg2Sn phases within grain during creep.
关键词:
Magnesium
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Byoungho Kim
,
Jongjin Jeon
,
Yeongdo Park
,
Yongho Park
,
Ikmin Park
材料科学技术（英）
The ageing behavior of Mg-xAl-Zn alloys with a variation of Al contents (x=3, 5, 7, 9 and 11 wt pct) were investigated. Solid solution treatment and artificial ageing were carried out at 693 and 493 K, respectively. After the solid solution treatment, β-Mg17Al12 was resolved to the α-Mg matrix in the specimens which contained Al up to 9 wt pct and partially resolved in the specimen of 11 wt pct Al. During ageing, the β-Mg17Al12 phase was precipitated at the grain boundary in the form of discontinuous precipitation and grown into the matrix. The volume fraction of β-phase was increased with the Al contents. Tensile strength increased with the volume fraction of precipitated β-phase, which was believed to strengthen the matrix.
关键词:
Ageing
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