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The initial Samples were numbered from Y1 to Y6 after milling in order, and then numbered from S1 to S6 after leaching with 9.3M HCl[7] in order.
As a result of the addition of Mg powder, the diluents, MgO, crystallized in the grain boundary of TiB2 crystal, which prevented the growth of initial TiB2 nucleus.

The limestone granulometry has been modified so that the sample contains grains of 20 to 40 μm in size.
Acknowledgements This work was financially supported by project number: 15-08755S “Study of effects of samples preparation on inorganic binders’ final properties”, project number FAST-J-17-4604 “Monitoring the properties of the limestone during thermal loading by DKTA, DSC and XRD-HT methods” and project No.

Stress cloud of cutting district given stress value, the expansion rate of injury is increasing with the cycle number increments, when the cycle number reaches a permanent fatigue damage value, damage nuclear will also appear in the cutting region, the fibrosis degree of metal grain will reduce.

Electroplating craft. 140/170 grain size is selected according to the roughness and accuracy of workpiece ground.
It can be seen from table 3 that parallel degree, vertical degree gradually deteriorate along with the increasing of the ground workpiece number, while the ground Name or Items Specification or Parameters Wheel type BN140Pφ60×3.14T×13d Rotate speed of the wheel ns=21000~23000r/min , ds =φ60mm Workpiece and its surface to be ground Vane slot of cylinder Workpiece material cast iron Grinding allowance ap = 0.05mm Cooling mode Water cooling Machining cycle 30s surface roughness Rz is improved.
Table 3 Changing rules of ground workpiece quality Grinding number (piece) Rz [µm] Parallel degree [µm] Vertical degree [µm] 1 3.8 2.0 1.5 500 2.8 2.0 1.6 1000 2.1 3.1 2.8 1500 1.2 3.8 4 Analysis of wheel wear.

Fig. 3 is a fatigue test result shown with max stress-number of cycles curve.
Fatigue cracks can initiate easily at slip band, grain boundary and interface between inclusion and matrix.
Fig. 2 Engineering stress-strain curves of samples; a) N and NPB, b) MC and MCPB Fig. 3 Max stress-number of cycles curves of samples; a) N and NPB, b) MC and MCPB Table 3 Comparison of mechanical properties with fatigue limit for NPB and MCPB materials YS [MPa] UTS [MPa] FL [max, MPa] FL/UTS NPB 262 336 305 0.90 MCPB 282 356 355 0.99 -0.05 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0 50 100 150 200 250 300 350 400 + +PB Engineering stress [MPa] Engineering strain [mm/mm] a)))) -0.05 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0 50 100 150 200 250 300 350 400 MC MCPB Engineering stress [MPa] Engineering strain [mm/mm] b)))) 104 105 106 280 300 320 340 360 380 + +PB Max stress [[[[ MPa]]]] +umber of cycles to failure [[[[+f , log10]]]] a)))) 103 104 105 106 280 300 320 340 360 380 MC MCPB Max stress [MPa] +umber of cycles to failure [[[[+f , log10]]]] b)))) Fatigue fracture

coordination number and Q n group distributions (n number of bridging oxygens of phosphate and/or silicate groups), but also linkages between like or different groups in the amorphous state.
This most important result leads to the only assumption made for the structural proposal: Given that a grain of sample contains crystalline and amorphous regions, it should be reasonable to assume that there is a crystalline core (HAp) surrounded by an amorphous surface layer.

They were integrally formed with the matrix after sintering in high temperature, so that the composite material formed a large number of circular air pores.
The mullite formed the glass phase and located into grain boundary.
When the mullite hollow balls were added in the material, density should be sharp decline with a large number of circular air pores.

The average number of valence electrons by atom (e/a) is parameter used characterize these alloys.
It is known that there is a linear correlation between the average number of valence electrons per atom and the martensite start temperature [13].
This is a sign of the fast crystallization and growth kinetics of the alloy, and suggests that heat removal during rapid solidification process induces directional grain growth of the formed crystalline phase.

The research indicates that the addition of Cu could promote the formation of a uniformly distributed and rod-shaped strengthening phase β' 1-MgZn2 with a high number density[13-15].
On the basis of a large number of references[9,11,14-15], the content of Cu is identified as 1.0wt.%.
By comparison, with the increase of aging time, the eutectic structure at the grain boundary is dissolved, and tends to be more granular, and the shape becomes more rounded.

Introduction ZrB2 is of particular interest because of the unique property combination of high refractoriness, high-electrical and high-thermal conductivity, chemical inertness against molten metal or nonbasic slag and good thermal shock resistance [1], which make it attractive candidates for high-temperature applications where corrosion-wear-oxidation resistance is demanded, because of its higher cost of production, has found a limited number of applications.
Refractory oxides, such as aluminia, ziromina, yttria and mullite, show the best resistance in these environments, and a number of these have been evaluated as coating for other ceramics[5].
The uncoated ZrB2 sample’s surface micrograph was showed in Fig.2, it can be seen that the ZrB2 grain boundary became smooth and there was about 5-6% open porosity on the surface, meeting with the as received composites having 95% relative density.