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《Rare Metal Materials and Engineering》 2005-10
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Study on the Nano-Crystalline and Amorphous Al-Pb Series Powders Synthesized by Mechanical Alloying

Ran Guang, Zhou Jing’en, Xi Shengqi, Wang Yongfang (State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China)  
Systematical investigations were carried out on the transformation, grain size, and morphology of the Al-15%Pb-4%Si-1%Sn- 1.5%Cu powders during the MA at the condition of ball to powders ratio of 8:1, the rotation speed of 280 r/min and the ball to powders ratio of 25:1, the rotation speed of 450 r/min using X-ray diffraction (XRD) and transmission electron microscopy (TEM). The experimental results show that the nano-crystalline powders are synthesized by mechanical alloying. During high-energy ball milling, the mixture powders are firstly fined, and then alloyed, nano-crystallized and the nano-crystalline partly transformed to amorphous. Meantime, the larger ball to powder ratio and the higher the rotation speed while the more energy provided by the system of ball mill, the shorter time to synthesize the nano-crystalline. Basing on the model of multilayer amorphization during MA, it illustrates the feasibility of amorphization of Al-Pb powder with ΔHmix≈1.34. The driving force for amorphous is provides not by the large negative heat of mixing (without ΔHmix0) but by sharp concentration gradients in Al-Pb series powders.
【CateGory Index】: TB383;
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