(東南大學(xué)材料科學(xué)與工程系， 南京 210096)
摘 要: 研究了Sn對(duì)鎂合金顯微組織和力學(xué)性能的影響。 研究結(jié)果表明， 純鎂中加入Sn后能使純鎂鑄錠中粗大的柱狀晶轉(zhuǎn)化為均勻的等軸晶， 并有效地細(xì)化晶粒， 同時(shí)在顯微組織中形成具有立方C1結(jié)構(gòu)的Mg2Sn顆粒相。 由于Mg2Sn顆粒相顯微硬度和熔點(diǎn)高， 熱穩(wěn)定性好， 因而對(duì)基體具有有效的彌散強(qiáng)化作用， 提高了MgSn二元合金的室溫及高溫強(qiáng)度。 在Mg9Al0.8Zn基合金中加入少量的Sn便能有效地提高合金的耐熱性， 而加入過(guò)多的Sn反而會(huì)導(dǎo)致合金高溫強(qiáng)度下降。
關(guān)鍵字: 鎂合金 錫 力學(xué)性能
MECHANICAL PROPERTIES OF MAGNESIUM ALLOYS
（Department of Materials Science and Engineering, Southeast University, Nanjing 210096, P. R. China
）
Abstract:Effects of Sn addition on the microstructure and mechanical properties of magnesium alloys were studied. Results showed that the Sn addition to magnesium modifies the microstructure of magnesium ingot and causes the formation of Mg2Sn precipitates with C1 cubic structure. The strength of Mg-Sn alloy has increased at both ambient and elevated temperatures due to the high micro-hardness and melting point as well as the high thermal stability of the precipitates. In the ternary alloy of Mg-9Al-0.8Zn small amount addition of Sn results in significant improvement of heatresistance. However, the excessive Sn addition to Mg-9Al-0.8Zn leads to the decrease of the strength at elevated temperature.
Key words: magnesium alloy Sn mechanical property
