力學性能的影響
(東北大學 材料與冶金學院， 沈陽 110004)
摘 要: 探索了通過加入金屬Mn并結合熔體熱處理工藝來控制鋁硅合金中富鐵相的形態(tài)。 結果表明： 熔體經過預先熱處理后， 加入Mn可以使絕大多數(shù)針狀鐵相轉變成塊狀鐵相， 且粒徑均一； 預先熱處理可以減少Mn的加入量而取得較好的效果， 適宜的加入量為x(Mn)/x(Fe)=0.5~1.1(摩爾比)， 并可以通過控制Mn的加入量來控制塊狀富鐵相雜質的粒徑大小； 經過聯(lián)合處理的含鐵鋁硅合金的抗拉強度提高40~80MPa， 伸長率提高6%~7%。
關鍵字: 富鐵相； 預先熱處理； 雜質； 粒徑； 力學性能
（ School of Materials and Metallurgy, Northeastern University,
Shenyang 110004, China）
Abstract: The control of the shape of iron-rich phase were realized by adding manganese in melt of Al-Si alloy and pre-heat treatment. The results show that the needle-like iron phase can mostly be transformed into lumpish by adding manganese after pre-heat treatment, and the grain sizes are symmetrical. The better effect can be gained by adding less manganese after heat-treatment, and the grain size can be controlled by controlling the amount of manganese basically. The suitable amount of Mn is x(Mn)/x(Fe)=0.5~1.1(molar ratio). After the combined treatment, the tensile strength and elongation of Al-Si alloy are improved by 40~80MPa and 6%~7%, respectively.
Key words: iron-rich phase; pre-heat treatment; impurity; grain size; mechanical property
