Lee, Sang Gu
(Department of Material Science and Engineering, Pusan National University San 30 Jangjeon-dong, Geumjeong-gu, Busan 609-735, Republic of Korea)
,
Jeon, Jong Jin
(Department of Material Science and Engineering, Pusan National University San 30 Jangjeon-dong, Geumjeong-gu, Busan 609-735, Republic of Korea)
,
Park, Kyung Chul
(Corresponding author. Tel.: +82 51 510 2851)
,
Park, Yong Ho
(fax: +82 51 514 4457.)
,
Park, Ik Min
(Department of Material Science and Engineering, Pusan National University San 30 Jangjeon-dong, Geumjeong-gu, Busan 609-735, Republic of Korea)
Highlights► The microstructure of the as-cast TAS652 alloy mainly consisted of α-Mg, Mg17Al12 and Mg2Si and Mg2Sn phases. ► The Mg17Al12 phase dissolved into the α-Mg matrix after the solution heat-treatment at 420̊C for 4h and the Mg17Al12 and Mg2Sn phases were f...
Highlights► The microstructure of the as-cast TAS652 alloy mainly consisted of α-Mg, Mg17Al12 and Mg2Si and Mg2Sn phases. ► The Mg17Al12 phase dissolved into the α-Mg matrix after the solution heat-treatment at 420̊C for 4h and the Mg17Al12 and Mg2Sn phases were finely distributed within the Mg matrix after the aging heat-treatment. ► The improved tensile and creep resistance of the peak-aged TAS652 alloy resulted from the finely dispersed Mg17Al12 and Mg2Sn phases. AbstractThis study examined the high temperature mechanical properties of as-cast, solution-treated and aging-treated Mg–6Sn–5Al–2Si alloy. The microstructure of as-cast Mg–6Sn–5Al–2Si alloy mainly consisted of α-Mg, Mg17Al12, Mg2Si and Mg2Sn phases. After solution heat-treatment, most of the Mg17Al12 phases were dissolved into the matrix. In the case of aging heat-treatment, finely distributed Mg17Al12 and Mg2Sn phases were evenly formed inside the grains. The ultimate tensile strength of solution treated Mg–6Sn–5Al–2Si alloy at 25°C was decreased due to the reduced volume fraction of Mg17Al12 phase. However, the creep resistance was increased by solution heat-treatment because of complete dissolution of the thermally unstable Mg17Al12 phase into the Mg matrix. On the other hand, both the tensile strength at 25°C and creep resistance of the peak-aged Mg–6Sn–5Al–2Si alloy were improved as compared to those of the as-cast alloy. It seems that the improved mechanical properties were associated with finely distributed Mg17Al12 and Mg2Sn phases.
Highlights► The microstructure of the as-cast TAS652 alloy mainly consisted of α-Mg, Mg17Al12 and Mg2Si and Mg2Sn phases. ► The Mg17Al12 phase dissolved into the α-Mg matrix after the solution heat-treatment at 420̊C for 4h and the Mg17Al12 and Mg2Sn phases were finely distributed within the Mg matrix after the aging heat-treatment. ► The improved tensile and creep resistance of the peak-aged TAS652 alloy resulted from the finely dispersed Mg17Al12 and Mg2Sn phases. AbstractThis study examined the high temperature mechanical properties of as-cast, solution-treated and aging-treated Mg–6Sn–5Al–2Si alloy. The microstructure of as-cast Mg–6Sn–5Al–2Si alloy mainly consisted of α-Mg, Mg17Al12, Mg2Si and Mg2Sn phases. After solution heat-treatment, most of the Mg17Al12 phases were dissolved into the matrix. In the case of aging heat-treatment, finely distributed Mg17Al12 and Mg2Sn phases were evenly formed inside the grains. The ultimate tensile strength of solution treated Mg–6Sn–5Al–2Si alloy at 25°C was decreased due to the reduced volume fraction of Mg17Al12 phase. However, the creep resistance was increased by solution heat-treatment because of complete dissolution of the thermally unstable Mg17Al12 phase into the Mg matrix. On the other hand, both the tensile strength at 25°C and creep resistance of the peak-aged Mg–6Sn–5Al–2Si alloy were improved as compared to those of the as-cast alloy. It seems that the improved mechanical properties were associated with finely distributed Mg17Al12 and Mg2Sn phases.
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