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Recently, much importance was attached to synthesis and characterization of nanocrystalline iron nitrides for their unique magnetic properties and improved performances determined by the smaller grain/particle size, surface structure and inter-particle interaction[10-15].
A careful calculation, based on the (200) diffraction peak of its XRD pattern, gives its lattice parameter = 2.870 Å, corresponding to the standard value a = 2.876 Å of Fe-Cr (Card number: 34-0396).
Besides, from the half-width of XRD peaks of the powder samples (shown in a of Fig. 1(b)), the grain size is estimated as 50–80 nm for nano-crystalline (Cr,Fe)N.

It can be due to that specific surface area of pore forming agent with the small particle size is large and the particle number is more than those with large particle size.
When it mixed with alumina powder, it can be used as fine grain skeleton to fill in pores and increase the grain bulk density due to relatively high homogeneous mixing degree.

The numbers indicate the minimum yield strength in ksi.
Fig. 7 illustrates the weld root at higher magnification where it appears grain growth has occurred across this lazy-S feature.
Micrograph illustrating grain growth across the root flaw.

All methods are based on assessment of a high number of penetration tests at locations affected by seismic activity, where in some, liquefaction of soils in the ground has been observed while in others, liquefaction has not occurred.
Fig. 2 Examples of CRR curves used in the respective methods Fig. 2a [3], Fig. 2b [4] Correction of measured penetration resistance qc is based on consideration of the magnitude of effective geostatic stress or consideration of the content of fine-grain particles in the soil.
The granularity of brown-coal ashes corresponds to fine-grain sand to silty sand.

Grains are located in the direction of heat removal.
The grain size is 100-500 μm.
The surface of the rupture site is characterized by a large number of facets, which characterizes material as a sufficiently high plasticity, and characteristic of brittle fracture by metallic luster.

The microstructure of as-cast EN AC-46500 (Fig. 6) consists of primary grains of the α-solid.
In contrast to the thixocasting process, eutectic microconstituent occluded in the α-grains was not observed.
Acknowledgements The authors thank the Comisión Interministerial de Ciencia y tecnología (CICYT) of Spain for the support provided under projects numbers: DPI2005-02456 and CICYT DPI2007-62948.

First, PCBN tool has good wear resistance for the high hardness and high stability of CBN grains.
Seen from appearance, its wear mainly is mechanical wear, also it generates CBN grain abscission.
So Usui's model is used to predict tool wear in this paper.The author of literature [4] did a large number of experiments to deeply study tool wear forms and tool life when the PCBN tool (AMBORITE DBC50) cutting GCr15, the influence law of workpiece hardness and cutting speed on PCBN tool wear are obtained.

The index system reflects an interrelated and interdependent group of statistical indicators with a number of indicators in a complex system, so that it can completely and accurately reflects many aspects of realistic situation about the development of the urban agglomeration on the west coast of the strait, and instructs the urban agglomeration on the west coast of the strait developing healthily and rapidly.
(See Table 1) Table 1 Evaluating Index System of Urban competitive power of the urban agglomeration on the west coast of the strait A Horizon B Horizon C Horizon Units Urban competitive power of the urban agglomeration on the west coast of the strait B1 Economic Power C1 Regional Gross Product Per Capita One hundred million Yuan C2 The Social Fixed Assets Investment One hundred million Yuan B2 Financial Power C3 The RMB Outstanding Loan in Financial Institutions Ten thousand Yuan C4 The RMB outstanding Deposits in Financial Institutions Ten thousand Yuan B3 Science and Education Power C5 Spending on Science and Technology Ten thousand Yuan C6 Spending on Education Ten thousand Yuan B4 Government Power C7 Local Financial Revenue Ten thousand Yuan C8 Local Financial Expenditure Ten thousand Yuan B5 Development Level C9 Grain Production Ton C10 Industrial Output over the Scale One hundred million Yuan B6 Industrial Structure C11 The Ratio of the Second and the Third Industries
(4) Table 2 Each Indicators’ Grey Correlation Coefficient and Weight in Synthetic Evaluation of Urban competitive power of the urban agglomeration on the west coast of the strait (2010) Indicators Grey Correlation Coefficient Weights C1 Regional Gross Product Per Capita 0.553 0.072 C2 The Social Fixed Assets Investment 0.497 0.065 C3 The RMB Outstanding Loan in Financial Institutions 0.510 0.067 C4 The RMB outstanding Deposits in Financial Institutions 0.520 0.068 C5 Spending on Science and Technology 0.493 0.064 C6 Spending on Education 0.582 0.076 C7 Local Financial Revenue 0.557 0.073 C8 Local Financial Expenditure 0.567 0.074 C9 Grain Production 0.653 0.085 C10 Industrial Output over the Scale 0.530 0.069 C11 The Ratio of the Second and the Third Industries to GDP 0.576 0.075 C12 The Added Value of the Tertiary Industry 0.570 0.075 C13 Annual Total Water Supply 0.534 0.070 C14 Green Coverage

However, Cotterell's approach suffers from the limitation that it requires large number of identical specimens with varying pairs of identical notch lengths at two edges inducing variation in ligament lengths.
Standard metallographic technique of grinding and polishing up to 0.25 µm diamond finish followed by etching using Marshall's reagent was employed to reveal the microstructure and to estimate the average grain size.
The microstructure exhibits ferrite grains with average size of 12.38 +0.27 µm.

Introduction The self-polarization effect is extremely important for integrated pyroelectric sensor array fabrication, where ferroelectric switching is unemployable and where a large number of small sensor elements should be poled uniformly in an easy way.
Our sputter-deposited films had XRD-coherence lengths (grain sizes) evaluated from the X-ray diffraction peak broadening of about 40 to 60 nm and c/a values of 1.032 to 1.045.
However, domain walls of thin films are pinned in fine grains or even by the space charge field at the bottom electrode.