【摘要】：研究了Mg、Si質(zhì)量比對Al-4Mg-xSi-0.6Cr合金組織和性能的影響。結(jié)果表明,未加入Si時,Mg主要固溶于α-Al基體中,少量形成顆粒狀的Al_3Mg_2相,綜合力學性能好。隨著Si的加入,Mg主要與Si形成Al-Mg_2Si共晶組織,合金強度顯著提高,但是塑性急劇下降。Mg、Si元素質(zhì)量比減小導致Al-Mg_2Si共晶組織層片間距增大,形貌變?yōu)閹в屑舛说陌级噙呅?容易在拉伸過程中形成應力集中,加速合金斷裂。當Mg、Si質(zhì)量比減小到1.6時,繼續(xù)提高Si含量,Mg_2Si相的數(shù)量不再增加,但是有長條狀共晶Si生成,強化合金的同時使合金的塑性進一步降低。含Cr相的種類和形貌與Mg、Si元素質(zhì)量比有關,過剩Mg時Cr元素以大塊狀Al13Cr2相存在,過剩Si時Cr元素以不規(guī)則狀Al5(Cr,Fe)Si相均勻分布。
[Abstract]:The effect of Mg,Si mass ratio on the microstructure and properties of Al-4Mg-xSi-0.6Cr alloy was studied. The results show that when Si is not added, Mg is mainly solid solution in 偽-Al matrix, a small amount of granular Al_3Mg_2 phase is formed, and the comprehensive mechanical properties are good. With the addition of Si, Mg formed Al-Mg_2Si eutectic structure mainly with Si, the strength of the alloy increased significantly, but the plasticity decreased sharply. The decrease of Mg,Si element mass ratio resulted in the increase of the interlamellar spacing of Al-Mg_2Si eutectic microstructure. The morphology of the alloy becomes concave polygon with tip, which is easy to form stress concentration in the tensile process and accelerate the fracture of the alloy. When the mass ratio of Mg,Si decreases to 1.6, the amount of Mg_2Si phase does not increase when the content of Si continues to increase, but the long stripe eutectic Si is formed, which further reduces the plasticity of the alloy while strengthening the alloy. The type and morphology of the Cr phase are related to the mass ratio of Mg,Si elements. The Cr element exists as a large block Al13Cr2 phase when the Mg is excess, and the Cr element distributes uniformly in the irregular Al5 (Cr,Fe) Si phase in the excess Si phase.
【作者單位】： 上海汽車集團股份有限公司技術(shù)中心;上海交通大學材料科學與工程學院;
【基金】：上海汽車工業(yè)發(fā)展基金資助項目(1519)
【分類號】：TG146.21;TG249.2

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