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Aggregate gradation Aggregate grading decision between the mineral aggregate particles embedded in the size of the extrusion force and mixture compaction degree, directly influence the high temperature stability of asphalt mixture.Research shows that in the optimum asphalt content, grain type asphalt concrete rutting minimum, fine particle type, coarse grain type rut is the largest.Westtrack ring test also draws similar conclusions.Simply increase the mineral aggregate size, therefore, is not necessarily can improve mixture high temperature stability, the key is to form a good embedded skeleton structure, and maintain a certain compactness.Screen hole pass rate is generally recognized as important influencing factors of asphalt mixture structure form[4].
Table 3 The mix different RCC times rutting test results Mixture type RCC / (time) Void fraction/(%) Dynamic stabilityDS/（time.mm-1) SUP-19 24 4.75 1964 18 5.24 1500 12 7.12 602 AC-20 24 4.51 1758 18 5.16 1401 12 7.21 596 SAC-19 24 4.43 2126 18 4.89 1326 12 5.78 665 For different RCC times (respectively provided the RCC 24 times, 18 times, 12 times) of the rut specimen, with the gradual reduction of the number of times of compacted mixture is difficult to compaction, the porosity is increased significantly, and the dynamic stability significantly reduced.

Microstructure [9] for prediction aspects including nucleation density, grain size, the more adequate for filling the nucleation density larger but grain size smaller, directly determines the physical and mechanical properties of finished components.
Therefore, we can improve the mechanical properties of the final product by increasing the number of riser in the casting design to increase the adequacy of filling.

According to them, the crowns that performed best in the mineral soil were identified as numbers 3, 5, 7 and 10.
Figure 1-Pareto – Standardized Effects It is shown that the best significant combination relates to the addition of Fe, Cu, Co with grain sizes between 0.9 and 3.5, in relation to the expected wear and combined with tungsten carbide and silicon carbide.Figure 2 shows probability between controllable factors (X) and expected result (Y) of wear.
Figure 2- Probability of interaction between variables Figure2 shows the normal probability between materials and grain sizes of crowns cited by experts in the field.

. %), carbon atoms’ pinning effect on austenite grain coarsening is not as prominent as that of top and center one.
The growth of austenite grain would inevitably lead to the coarsening of the ferrite plates.
The increase of the carbon tends to form more cementite, while with the decrease of the carbon the number of the Mo2C increased. 2.

It has been commonly thought that grain boundary reinforcement is paramount to producing creep resistant alloys [7, 8].
In this work, microhardness and creep measurements have been used to determine the effects of heat treatment on a HPDC Mg-RE alloy, which contains highly soluble Y for solid solution strengthening and possibly precipitation hardening, and low soluble La for a continuous network of intermetallic phase at grain and cell boundaries.
The microhardness measurements in the ‘core’ region show greater degrees of variation over a number of measurement points.

Both technological and scientific interests in ultrafine-grained powders for processing of ceramic components are motivated by the promise of improved sinterability, reduction in flaw sizes and low-temperature superplastic deformation.
Nanocrystalline materials have been synthesized by a number of techniques comprising all three phases, namely, the solid phase, the solution phase, as well as the vapor phase [3].
As discussed in [8], the presence of broad peaks in X-ray diffraction patterns is not sufficient to distinguish amongst materials which are amorphous or extremely fine grained, or a material in which very small crystals are embedded in an amorphous matrix.

The grain morphology is globular or rosette-like with grain size about 100-150 µm.
Theses include the thickness of the gate die being increased from 3 mm to 4.5 mm, the cross section area of the runner being doubled, and the number of the riser being increased from 2 to 6.

Fig. 7: Surface morphology A: 93%Sn-7% Bi, B: 41%Sn-59%Bi, C: 27%Sn-73%Bi, D: 15%Sn-85%Bi, Current density: 50 mA/cm 2 , Sonication: 28 kHz Fig.9 shows a model to describe the compression of a grain by the shockwave pressure.
As plating proceeded, the kinks and steps became smaller in number and the irregularities in the surface reduced resulting in a smooth surface.
Generally, when the pressure increases, particles are crushed and a dense and smooth film is formed. →→→→ Sn or Bi Grain Cu substrate Magnification →→→→ →→→→ Conclusion 1) The Sn and Bi content and surface morphologies in the sonoelectrodeposited film showed a striking difference in accordance with a change in the [BiY ]/[BiY +SnY] rate in the bath. 2) A 41 wt.

The crystal orientation and grain size may also play important role as Young's modulus decreases drastically with decrease in grain size [12].
Acknowledgement The authors gratefully acknowledge the support of Specific Research Fields in Chung Yuan Christian University project under grant CYCU-98-CR-ME and the National Science Council of Taiwan under project number 96-2221-E-033-042-MY3.

Therefore, any Fe beyond the solubility limit forms constituents at grain and cell boundaries.
It was noted that with an increase of iron content in the aluminium rod, a larger number of bands appear, which are likely to be Al3Fe compounds.
In addition, the presence of sub-grains can be seen in these photographs at a magnification of at x2500 (Fig. 2).