TY - JOUR
T1 - Effects of heat treatment on microstructure and microhardness of Mg-3Sn-1Y alloy
AU - Xu, Chun Jie
AU - Tu, Tao
AU - Ma, Tao
AU - Yu, Ling
AU - Zhang, Zhong Ming
AU - Wang, Jin Cheng
PY - 2013/1
Y1 - 2013/1
N2 - A nominal composition of Mg-3Sn-1Y (mass fraction, %) magnesium alloy was prepared by casting with flux protection in electric-resistance furnace. The microstructures as-cast, solution treatment and aging hardening of the Mg-3Sn-1Y alloy by different aging treatments after solution treatment were investigated by an Olympus GX71 optical microscope (OM), an FEI QUANTA 400 scanning electron microscope (SEM) equipped with an energy-dispersive X-ray spectroscop (EDS), a RigakuD/max-3C X-ray diffraction (XRD), a TUKON2100 Vickers hardness tester and a CRY-2P differential thermal analyzer (DTA). The results show that as-cast Mg-3Sn-1Y alloy consists of dendritic α-Mg and intermittent mesh inter-dendrite boundaries Mg2Sn phase, the dispersion tiny particles and fine rod-shaped MgSnY phase. After the solution treatment, the Mg2Sn phase is completely redissolved, and the MgSnY phase with the high temperature stability still distributes in the matrix. The addition of yttrium elements can improve the high temperature stability of Mg-Sn alloy. Mg-3Sn-1Y alloy exhibits obvious aging hardening characteristics. The increase of the aging temperature is advantageous to the occurrence of aging hardening peak to some extent. On the contrary, grain growth of the matrix will decrease the function of separation and strengthening and delay the appearance of aging hardening peak as the ageing temperature is too high.
AB - A nominal composition of Mg-3Sn-1Y (mass fraction, %) magnesium alloy was prepared by casting with flux protection in electric-resistance furnace. The microstructures as-cast, solution treatment and aging hardening of the Mg-3Sn-1Y alloy by different aging treatments after solution treatment were investigated by an Olympus GX71 optical microscope (OM), an FEI QUANTA 400 scanning electron microscope (SEM) equipped with an energy-dispersive X-ray spectroscop (EDS), a RigakuD/max-3C X-ray diffraction (XRD), a TUKON2100 Vickers hardness tester and a CRY-2P differential thermal analyzer (DTA). The results show that as-cast Mg-3Sn-1Y alloy consists of dendritic α-Mg and intermittent mesh inter-dendrite boundaries Mg2Sn phase, the dispersion tiny particles and fine rod-shaped MgSnY phase. After the solution treatment, the Mg2Sn phase is completely redissolved, and the MgSnY phase with the high temperature stability still distributes in the matrix. The addition of yttrium elements can improve the high temperature stability of Mg-Sn alloy. Mg-3Sn-1Y alloy exhibits obvious aging hardening characteristics. The increase of the aging temperature is advantageous to the occurrence of aging hardening peak to some extent. On the contrary, grain growth of the matrix will decrease the function of separation and strengthening and delay the appearance of aging hardening peak as the ageing temperature is too high.
KW - Aging hardening
KW - Mg-3Sn-1Y magnesium alloy
KW - Microstructure
KW - Solution heat treatment
UR - http://www.scopus.com/inward/record.url?scp=84875333247&partnerID=8YFLogxK
M3 - 文章
AN - SCOPUS:84875333247
SN - 1004-0609
VL - 23
SP - 9
EP - 14
JO - Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals
JF - Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals
IS - 1
ER -