Search results

Introduction Fibre cementitious composite material with a "strain hardening" represents very formable fine-grained concrete with the matrix based on Portland cement reinforced with short fibers.
The number of micro-cracks increases during another load, but the width of each of micro-cracks is not increasing, and remains stable at 60 μm [2] until the time when one of the multiple cracking fails by fracture.

It indicates that the copper grain is the surface-centered cubic structure.
Fig.4: Capacity vs. cycle number for four kinds of electrodes.

There are a number of conventional specimen preparation techniques have been applied for the larger powders.
TEM analysis b a Fig.7a is TEM specimen image of the specimen and there was no clear grain boundary in specimen.

Table 1 The experiment parameters Number Wheel speed nt/rpm Workpiece speed nw/rpm Cutting depth ap/mm Feed rate V/mm 1 4000，7000 200 2.0 150 2 7000 200 0.5，2.0 150 Measuring of surface morphology.
That is because the broken crystals entered grain boundary and led the glass phases separating out on the surface when processing.

The process was developed initially for aluminium alloys, but since then FSW was found suitable for joining a large number of materials.
The different structure of the two alloys is easily identified; the 6061-T6 is characterized by larger grains and the 6082-T6 by precipitates dispersed in a finer matrix.

The morphology and micro- ∗ Corresponding author, Tel. 86-571-87951408, E-mail: yanghui@zju.edu.cn Table 1 Batch composition of samples (wt%) Sample number 95-alumina zircon ziconia 1 # 100 0 0 2 # 99 0 1 3 # 98 0 2 4 # 97 0 3 5 # 90 0 10 6 # 99.5 0.5 0 7 # 98.5 1.5 0 8 # 97 3 0 9 # 95 5 0 structure analysis of the samples were observed by HITACHI-570 and Cambridge stereoscan-600 scanning electron microscopes.
For the sample with the zircon additive, besides the fracture toughness improved by the stress-induced-phase-transformation of ZrO2 and micro-cracks, the effect of zircon on glass phase and the size of grain is also affective on the property improvement of the 95-alumina ceramic.

Secondly, others solid grains' interiors involve some liquid phase, whose size and shape are irregular (Fig. 1(b),(c)).
NA D N i i /)/2( 1∑= − = π Where N is the total number of the solid phase particles in the field of vision, and −D is the average diameter of all the solid phase particles.

The effect of micro dimples on lubricated condition becomes a major reason for friction and wear reduction, but in dry condition there are a number of the UNSM treatment effects that friction and wear properties was mitigated most involve increasing the surface hardness, inducing compressive strength and refining grain size.

However, the rapid increase of the steel ingot sizes easily induces such problems as internal voids, microstructural segregation, loose structures and large grain sizes.
A large number of research works have been reported on process design and the effects of design parameters in order to eliminate the internal defects and improve the microstructures [1-4].

Equivalent strain 111 +3.95αtanθ -0.0345α 002 -7.90αtanθ +0.0689α 220 +3.95αtanθ -0.0345α 113 -1.44αtanθ +0.0126α 222 -1.97αtanθ +0.0172α 004 +3.95αtanθ -0.0345α 440 -1.97αtanθ +0.0172α The assumptions were made by Warren that the number of stacking faults was small and there were no interactions between them.
White beam diffraction is well suited to measurement of several orders of reflection since the scattering angle is fixed at 90° and the wavelength is selected by diffraction from the grains in the sample.