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Microstructural evolution of copper-titanium alloy during in-situ formation of TiB_2 particles

Transactions of Nonferrous Metals Society of China 2013年第10期23卷 2994-3001页

作者： M.SOBHANI H.ARABI a.mirhabibi R.M.D.BRYDSON Center of Excellence for Advanced Materials and Processing School of Metallurgy and Materials Engineering Iran University of Science and Technology Center of Excellence for Ceramic Materials in Energy and Environmental Applications Iran University of Science and Technology Institute for Materials Research University of Leeds

Bulk Cu-Ti alloy reinforced by TiB2 nano particles was prepared using in-situ reaction between Cu 3.4%Ti and Cu-0.7%B master alloys along with rapid solidification and subsequent heat treatment for 1-10 h at 900 ℃. High-resolution transmission electron microscopy （HRTEM） characterization showed that primary TiB2 nano particles and TiB whiskers were formed by in-situ reaction between Ti and B in the liquid copper. The formation of TiB whiskers within the melt led to coarsening of TiB2 particles. Primary TiB2 particles were dispersed along the grain boundaries and hindered grain growth at high temperature, while the secondary TiB2 particles were formed during heat treatment of the alloy by diffusion reaction of solute titanium and boron inside the grains. Electrical conductivity and hardness of the composite were evaluated during heat treatment. The results indicated that the formation of secondary TiB2 particles in the matrix caused a delay in hardness reduction at high temperature. The electrical conductivity and hardness increased up to 8 h of heat treatment and reached 33.5% IACS and HV 158, respectively.

关键词： in-situ reaction TiB whiskers TiB2 particles Cu-Ti alloy composite

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Fabrication method and microstructural characteristics of coal-tar-pitchbased 2D carbon/carbon composites

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International Journal of Minerals,Metallurgy and Materials 2015年第2期22卷 210-216页

作者： Mohammad Esmaeeli Hamed Khosravi Alireza.mirhabibi School of Metallurgy and Materials Engineering Iran University of Science and Technology Faculty of Materials Science and Engineering K. N. Toosi University of Technology

The lignin-cellulosic texture of wood was used to produce two-dimensional （2D） carbon/carbon （C/C） composites using coal tar pitch. Ash content tests were conducted to select two samples among the different kinds of woods present in lran, including walnut, white poplar, cherry, willow, buttonwood, apricots, berry, and blue wood. Walnut and white poplar with ash contents of 1.994wt% and 0.35 lwt%, respectively, were selected. The behavior of these woods during pyrolysis was investigated by differential thermal analysis （DTA） and thermo gravimetric （TG） analysis. The bulk density and open porosity were measured after carbonization and densification. The mierostruc- tural characteristics of samples were investigated by scanning electron microscopy （SEM）, X-ray diffraction （XRD）, and Fourier-transform infrared （FT-IR） spectroscopy. The results indicate that the density of both the walnut and white poplar is increased, and the open porosity is decreased with the increasing number of carbonization cycles. The XRD patterns of the wood charcoal change gradually with increasing py- rolysis temperature, possibly as a result of the ultra-structural changes in the charcoal or the presence of carbonized coal tar pitch in the composite＇s body.

关键词： carbon/carbon composites microstructure porosity density densification carbonization

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