2, TiB2 promoted the formation of Al3Ti phase with the increase of B content, which led to grain refinement, crystal distortion increased, the risk of electron scattering enhanced and the excessing of B dissolved in the Al matrix simultaneously, so the conductivity decreased by 2.5%; when B content was 0.02%, the alloy’s electrical property achieved the best and the tensile strength have not reduced, the conductivity was 33.00%IACS."/>

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Observation and Analysis of Microstructure of the B-Containing Highly Conductive Al-Si alloy
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Ningbo Branch of China Academy of Ordnance Science,School of Materials Science and Engineering,Central South University,School of Materials Science and Engineering,Central South University,School of Materials Science and Engineering,Central South University,School of Materials Science and Engineering,Central South University,School of Materials Science and Engineering,Central South University

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TG146.2

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    Abstract:

    The effects of B addition on the lattice constant, grain size and electrical property of Al-Si casting alloys were investigated by Wheatstone Bridge Conductivity Measurement, Optical Microscope, Scanning Electron Microscope(SEM), Transmission Electron Microscope(TEM),X-Ray Diffraction(XRD) and Electron Probe Micro-Analyzer(EPMA) Analysis. The results indicated that impurities of Ti,Cr,Mn,V were converted from solid solution state to boride in the Al matrix when B content was increased in the range of 0.02%, meanwhile, the degree of lattice distortion decreased which resulted in the increase of the conductivity by 6.06%; When B content was over 0.02%, B and Ti formed TiB2, TiB2 promoted the formation of Al3Ti phase with the increase of B content, which led to grain refinement, crystal distortion increased, the risk of electron scattering enhanced and the excessing of B dissolved in the Al matrix simultaneously, so the conductivity decreased by 2.5%; when B content was 0.02%, the alloy’s electrical property achieved the best and the tensile strength have not reduced, the conductivity was 33.00%IACS.

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[Liu Hongwei, He Xiaolong, Yang Zhao, Wang Guangxu, Xu Xuexuan, Lu Jianning. Observation and Analysis of Microstructure of the B-Containing Highly Conductive Al-Si alloy[J]. Rare Metal Materials and Engineering,2017,46(8):2300~2305.]
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History
  • Received:April 30,2015
  • Revised:June 10,2015
  • Adopted:August 11,2015
  • Online: November 16,2017
  • Published: