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Study on Microstructure Properties and Deformation Behavior at High Temperature of Al-Pb Alloy

Author: ZuoJinCheng
Tutor: QiaoYingJie；GengLin
School: Harbin Engineering University
Course: Materials Science
Keywords: Al-Pb alloy Mechanical alloying Hot compression Damping properties Radiation protection performance
CLC: TF124.5
Type: Master's thesis
Year: 2009
Downloads: 28
Quote: 0
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Abstract


Al-Pb alloy prepared by mechanical alloying (MA) and vacuum hot pressing sintering (HP) and hot extrusion processing . By XRD, SEM, TEM microstructure of Al-Pb alloys to study its thermal compression deformation behavior of its room temperature tensile properties, damping properties were tested , and calculate its radiation protection performance . Prepared by MA Al-Pb alloy studied by SEM and XRD . The results showed that does not react in the MA process , Al and Pb . With increasing milling time in the MA process , decreasing the size of Pb stabilized after a period of time . This is because in the MA process , the alloy Ball milling effect , the deformed , cold crushing three effects caused . At the same time , Al-Pb alloy grain size with increasing milling time decreasing stabilized after a period of time . Vacuum hot pressing sintering and hot extrusion alloy samples by XRD phase analysis found that did not happen the same reaction between Al, Pb . Al-Pb alloy morphology were observed by SEM and found that the Pb particle sintering Pb atom diffusion grew up . Hot extrusion can be effectively refine the Pb particles in the Al matrix , is because during extrusion liquid Pb is fragmented by the surrounding Al substrate . The article also tested the mechanical properties of Al-Pb alloys at room temperature . Fine grain strengthening the role of the alloy itself dispersed Pb played a dispersion strengthened the role of the mechanical properties of Al-Pb alloy is much larger than the pure Al , so that it can be applied to the field of practical application . Theoretical calculations of the radiation protection of the Al-Pb alloy . Test the damping properties of Al-Pb alloy temperature spectrum by damping , the damping peak generation mechanism , two damping peaks at the grain boundary sliding and Pb phase melting . Analysis of high-temperature deformation behavior of the Al-Pb alloys to study the reasons for the decline of peak stress , calculate the apparent activation energy and the establishment of the flow stress equation , the results show that the high-temperature deformation behavior of thermal activation control .

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CLC: > Industrial Technology > Metallurgical Industry > Metallurgical Technology > Powder metallurgy (metal ceramic technology ) > Powder molding, sintering and post-processing > Sintering process
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