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中國有色金屬學報

ZHONGGUO YOUSEJINSHU XUEBAO

第9卷第1期總第30期 1999年3月

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文章編號：1004-0609(1999)01-0055-06

Sn對鎂合金顯微組織和力學性能的影響

孫揚善翁坤忠袁廣銀

(東南大學材料科學與工程系，南京 210096)

摘要: 研究了Sn對鎂合金顯微組織和力學性能的影響。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，并有效地細化晶粒，同時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高，熱穩(wěn)定性好，因而對基體具有有效的彌散強化作用，提高了MgSn二元合金的室溫及高溫強度。在Mg9Al0.8Zn基合金中加入少量的Sn便能有效地提高合金的耐熱性，而加入過多的Sn反而會導致合金高溫強度下降。

關(guān)鍵字: 鎂合金錫力學性能

EFFECTS OF Sn ADDITION ON MICROSTRUCTURE AND

MECHANICAL PROPERTIES OF MAGNESIUM ALLOYS

Sun Yangshan, Wen Kunzhong and Yuan Guangyin

（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 heatresistance. 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

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW