cu基原位变形复合材料的组织性能及加工工艺研究-材料加工工程专业毕业论文.docx

Deformation Processing,Microstructure and Properties of
Cu·-based In·-posites
Abstract
With bination of mechanical properties and electrical conductivity,Cu-posites are suitable for lhe applications of hi曲field resistive and pulse s,trolley wires for power car and the materials for lcad frame+However,our research and development on these materials have far fallen behind developed order to meet the demand of native modern petitive and low cost Cu—posites with both high strength and hi曲 conductivity should be researched the present investigation,Cu-16Fe,。5Cr, Cu-12Cr and have been prepafed by in—situ synthesis technique and heavy deformation bined with he鑫t treatments,The microstructure and mechanical properties as well as electrical conductivity have been studied by using Optical Microscopy(OM), Scanning electron microscopy(SEM),Electronic District Analysis(EDAX)and other test facilities.
Atier heavily cold working,the dendrites of Fe or Cr phase in the as-cast billets were elongated into strains could be obtained by cold drawing instead of the increase of drawing strains,filaments became longer and thinner,and the spacing between them was more average size of Fe or Cr filaments WaS around
hardening produced by deformation process caused significant improvement of tensile strength, while resulting in the reduction of eIectrical conduetivity and correlation between ultimate tensile strength and spacing of filaments could be described by Hall-Petch increase of drawing strains mad second-phase content induced the improvement of strength and decrease ofelectrical conduetiv酶and plasticity.
A little amount ofCr addition increased the strength ofCu—posites at higher strains and also improved the electrical ,because of brittleness and high hardness ofCr,highCr posite causedthe deterioration ofprocessing properties+
With se