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Produce copper conductor added with graphene 3 copies of copper powders are numbered with 0,1,2 and each of it weighs 2g.
Table 2 Hardness of the three copper sample Dot NO. 1 2 3 4 average 0（HV） 100.7 87.2 136.1 113.6 109.4 1（HV） 95.7 131.5 142.3 133.2 125.7 2（HV） 149.6 175.5 135.4 166.2 156.7 2 .analysis of experimental results 2.1 analysis of electric conductivity Some graphene distributes within crystal grain while the other stays in grain boundary after sintering.
Electrons arriving at grain boundary can be passed in all directions through graphene.
Some of them distributes in grain boundary so as to prevent copper grains growing up effectively during high temperature sintering.
Consequently, copper grain is fined and the strength and hardness are increased.

The use of the modified detectors then led to a lower number of complaints of the device.
The corrosion attack occurred in a limited number of locations on the metal surface.
It shows a number of slip bands and contains delta ferrite particles significantly elongated in a direction of forming (Fig. 3.b).
The microstructure of CrNiMo steels after solution annealing consists of austenite with small delta ferrite grains.
The surface would remain free of embedded sand grains.

Therefore, graphite is uniformly distributed in all specimens, and the same is observed at grain boundaries of α-Al grains in the microstructures.
Peak intensity in the XRD is the function of number of similar orientations present in the material.
The microstructure of hot compacted 2024 Al alloy shows fine grain structure with Al2Cu at grain boundaries (Figure 3(a).
The formation of Al2Cu at grain boundaries is due to slow cooling after hot compaction.
During hot compaction recystallization occurs, which starts with nucleation of new grains at former grain boundaries.

As well known, the reason for loss of current efficiency is grain loss owing to intergranular corrosion [8], therefore, the grain size of material has influence on the surface dissolution of the anode.
In comparison with the alloy I , the grain size and number of the alloy II were moderate; the shape and distribution of the second-phase particles were dispersive in the alloy II .
A mass of nonequilibrium segregation of Bi was produced at the Al grain boundaries, therefore, a large number of micro-corrosion cells formed along the α-Al matrix.
According to the preferential dissolution-shed mechanism of second phase particles, Bi was mainly segregated along the grain boundary, so that it made Al lattice distortion and damaged the bonding balance of Al grains.
As a result, some grain boundary defects formed and the passive film was separated.

The diffusion along the film/substrate interface and along the grain boundaries is driven by the capillary stresses in the film.
The model and results Let us consider the following model (Fig. 1): the surface of a thin film of a nominal thickness H0 is perturbed sinusoidally with the amplitude ∆H: ( ) ( ) ( )XtHHtXH ωsin , 0 ∆+= (2) The film is supposed to have a one-dimensional columnar grain structure with the grain size d.
The grain boundary and interfacial diffusion are driven by the inhomogeneous distribution of capillary stresses in the film.
The critical wavelength λ* depends on the ratio of interfacial and grain boundary diffusivities, on the film thickness and on the grain size in the film. 4.
Fundamentals of Grain and Interphase Boundary Diffusion, Wiley, Chichester (1995). 6.

Grain crushing is an irreversible physical process.
Where is the number of Normal l rupture after applying RC loads each time, is the total number of rupture after applying RC loads each time , is the total number of Normal rupture after applying RC loads each time，is the total number of initial connection.
After one time RC loading, the number of Tangential rupture is 5 and the number of normal rupture is 717.
Fig 2 The granular grinding process of large grains Fig 3 The particle fracture rate and RC times.
Experimental studies of the effects of grain breakage on the dilatancy and shears trength of rockfill.

The pores formed between adjacent grains resulted in grain conductivity losses.
By comparing the micrograph of non-irradiated sample in Fig. 3(a) and the electron irradiated sample in Fig. 3(b), it can be seen improvement in grain size, grain alignment and core density in the irradiated sample.
The gamma irradiation caused the grains to realign in a more ordered orientation.
Enhancement in the strength is directly related to the improvement in grain size, grain alignment and core density of the irradiated sample.
Sample Compressive Strength [MPa] Non-irradiated 163.64 40 kGy irradiation 294.87 80 kGy irradiation 245.16 In both the gamma and electron irradiation samples, creation of small defects within the microstructure of Bi-2212 phase would further reduce the number and size of pores.

Workpiece 7 is led by worktable 1 to Journal Title and Volume Number (to be inserted by the publisher) 123 realize the feeding movement of the horizontal direction.
The load of every diamond bead is variable in the scope of cutting width, and it is related to the number of beads contacting workpiece and the degree of stretch of the diamond wire, etc.
The change of maximal cutting thickness of a single diamond grain embodies the influence on load suffered by diamond grains inferred by cutting speed vs.
In a certain scope of velocity, with the increase of vs, the cutting thickness of diamond grains diminishes, and accordingly the load value of grain descends, and mechanical wear decreases and W increases.
At the same time the combiner intenerates, resulting in the increase of desquamation of diamond grains.

The melt spinning results in a notable grain refinement of the alloys without altering the phase structure of the alloys.
It is evident that both of the melt spinning and the Pr substitution bring on the major diffraction peaks of the alloys broadened obviously, to be ascribed to the refined grain and the stored stress in the grains by the melt spinning.
The activation capability of an electrode alloy was characterized by the number of charging-discharging cycles required for attaining the greatest discharge capacity through a charging-discharging cycle at 100 mA/g current density.
Fig. 3 Evolution of the discharge capacity of the as-cast and spun alloys with the cycle number: (a) Pr0.1；(b) As-spun (5 m/s) The discharge capacity of an alloy electrode is dominated by multiple factors, involving its crystal structure, phase composition and structure, grain size, composition uniformity and surface state, etc.
The melt spinning and the Pr substitution give rise to a notable refinement of the grains instead of changing the structure of the alloys.

At room temperature, bulk zirconia with large grain size exhibits typical monoclinic structure.
The main raw materials were fused calcium oxide partially stabilized zirconia (Ca-PSZ) aggregate and grain, monoclinic zirconia powder. 
The specimens consisted of the Ca-PSZ aggregate, Ca-PSZ grain, m-ZrO2 powder，and phenolic resin as binder.
The matrix of sintered specimens is almost fully sintered, and the grain boundaries of zirconia particles are fuzzy.
When the specific monoclinic zirconia powder (moderate size) was added, the zirconia refractories had good mechanical strength, reasonable phase composition, uniform microstructure and large numbers of internal micro-pores.