The effect of tin and nitrogen on liquid phase sintering of Al-Cu-Mg-Si alloys
The effect of tin and nitrogen on liquid phase sintering of Al-Cu-Mg-Si alloys
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DOI：
10.1016/j.actamat.2008.01.047
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发表时间：
2008-06-01
期刊：
影响因子：
9.4
通讯作者：
Hill, A. J.
中科院分区：
文献类型：
--
作者：
Schaffer, G. B.;Yao, J. -Y.;Hill, A. J.
采用元素粉末和传统的压制烧结粉末冶金技术制备了Al-3.8Cu-1 Mg、Al-3.8Cu-1 Mg-0.7Si、Al-3.8Cu-1 Mg-0.1Sn和Al-3.8Cu-1 Mg-0.7Si-0.1Sn合金。这些合金的烧结是在590摄氏度下，在氮气或氩气的气氛下，使用水平排列的推杆温度计进行研究。烧结样品的特征在于使用扫描电子显微镜和正电子湮没寿命谱，在氩气下，收缩发生在一个单一的阶段，收缩率随时间单调衰减。氮气下的烧结收缩发生在三个不同的阶段，并且速率随时间增加。锡在氩气下减少收缩，但在氮气下激活收缩。正电子能谱表明，锡的存在下不改变烧结合金中的空位浓度，这表明锡不优先结合在这些AlCuMgSi合金中的铝基体中的空位。相反，锡似乎可以限制氮化铝在特定表面上的形成。(C)2008 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Alloys of Al-3.8Cu-1Mg, Al-3.8Cu-1Mg-0.7Si, Al-3.8Cu-1Mg-0.1Sn and Al-3.8Cu-1Mg-0.7Si-0.1Sn were made using elemental powders and conventional press-and-sinter powder metallurgy techniques. The sintering of these alloys was studied at 590 degrees C under atmospheres of nitrogen or argon using a horizontally aligned, push-rod dilatometer. Sintered samples were characterized using scanning electron microscopy and positron annihilation lifetime spectroscopy, Under argon, shrinkage occurs in a single stage and the shrinkage rate decays monotonically over time. Sintering shrinkage under nitrogen occurs in three distinct stages and the rate increases over time. Tin decreases shrinkage under argon but activates shrinkage under nitrogen. Positron spectroscopy indicates that the presence of tin does not alter the vacancy concentration in the sintered alloys, suggesting that tin does not bind preferentially to vacancies in the aluminum matrix in these AlCuMgSi alloys. Rather, it appears that tin may limit the formation of aluminum nitride on specific surfaces. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.