Search results

However, in the untreated cast hypereutectic Al-Si alloy, there are a large number of thick strips, five petal star shaped primary silicon and long needle shaped eutectic silicon.
This is mainly because the addition of Co in the alloy forms the main intermetallic compound CoSi2, and the co atoms are dispersed in the matrix and precipitates in the form of solute elements, resulting in lattice distortion, increasing grain defects, improving the scattering ability of electrons, and significantly reducing the conductivity of the alloy.
Therefore, it is obvious that the conductivity (or resistivity) of binary Al-Si alloy will be greatly affected by the number of silicon phases in the microstructure.

In order to evaluate pseudoelasticity, a cyclic loading and unloading tensile test was selected where the applied strain increased by 2% per cycle with increasing the number of loading-unloading cycles. 0.2% flow stress (σ0.2) was employed as yield stress (or stress for inducing martensite or stress for reorientation of martensite variants).
The grain size of parent β phase was hardly determined because of the dense α" martensite plates.
Since the strength must be related with solution hardening by ternary additions, the lattice mismatch εlattic by substituting ternary atoms for the titanium atoms are calculated and listed in Table 1 using Goldschmidt radii: εlattice = (rternary/rTi -1)x100 (%), where rT and rternary are Goldschmidt radii of Ti (0.147nm) and a ternary element, respectively, with the coordination number of 12.

In [13], the authors investigate the problem of finding a routing structure which can minimize the number of transmitted packets, and it is shown that routing packets on any two shortest path trees does not affect the effectiveness of data aggregation significantly.
In Table 1, ld denotes the size of a data item, R denotes the communication radius of a sensor node, Esent and Ercv denote the energy consumption by sending and receiving one bit of data respectively,mi denotes the number of data items generated in one epoch, Lquery denotes the bit length of a top-k query, and QR denotes the query region.
Verifiable fine-grained top-k queries in tiered sensor networks, In Proc. of IEEE INFOCOM, 2010

Metallic binders of diamond tools designed for processing hard ceramic and mineral materials have to feature a high resistance to abrasive wear under the action of particles of the material being processed and to retain diamond grains securely.
The backscattered electron microstructure images were obtained with contrast depending on the atomic numbers of the components.
This is confirmed by copper forming a number of intermetallic compounds with tin while with cobalt it forms a system with limited solubility and peritectic transformation.

The grain size was calculated using the Scherrer formula of D=0.89λ/βsinθ, in which D is the crystalline size, λ is the wavelength of X-ray, and θ is the diffraction peak angle. 2.3 Electrode preparation and electrochemical characterization A certain amount of CuSnO3, acetylene black and polyvinylidene difluoride(PVDF) was made into slurry with a mass ratio of 75:12.5:12.5 in N-methyl pyrolidinone(NMP).
Capacity (mAh/g) Voltage (V VS Li) 0 1000 2000 3000 0 1.0 2.0 3.0 Fig.5 The initial two discharge-charge curves of CuSnO3 Fig.6 shows the variation of reversible capacity as a function of cycle number.
Even in the 20th cycle, the charge capacity is 640 mA·h/g, the reversible capacity remains 82.5% that of the first cycle, the average capacity fade rate is 0.87% per cycle. 0 5 10 15 20 0 200 400 600 800 1000 Cycle number Capacity (mAh/g) discharge charge Fig.6 Cycle-ability of CuSnO3 Conclusions [1]By chemical co-precipitation method using SnCl4·5H2O, NH3·H2O and Cu(NO3)2·3H2O as raw materials, amorphous CuSnO3 were prepared as a novel anode material for lithium ion batteries and it demonstrates a large capacity and a low insertion potential with respect to Li metal.

Thus, there were recorded a number of 169 dumps for industrial wastes which are under the stipulations of Directive 1999/31/EC, of which: 66 spoil banks for solid wastes; 52 slag and ash dumps, 40 storage pits (others than those for wastes from the extractive industry); 11 sludge ponds (other than those for wastes from the extractive industry). [6] The great waste quantities that exist both nation - and worldwide made necessary the accomplishment of some practical attempts for their processing and reintroducing into the economic circuit.
The way of carrying out the mixes (mixing formula) was made based on a technological fabrication flow (Figure 1), which foresaw the material grinding with the aid of a Kollergang mill, followed by a grain-size sorting made with the aid of a "Analysette 3" Fritsch vibrating sieving machine (the fraction used was less than 250µm); the material dosage was made based on the pre-established mixing formulae with the aid of a Sartorius technical balance and the homogenising was made with a homogenising barrel.
Results and Discussions In order to obtained this covering and insulating powders, some factors are important: - the covering material shall not react with the steel; - hydrogen, oxygen, nitrogen, or other gases and noxes shall not be released; - the metal bath shall not be contaminated with oxides or other inclusion types; - the liquid slag layer formed at the surface of the hot metal shall reduce the heat release to the open, as much as possible, thus decreasing the steel temperature; - the covering layer shall be capable to absorb all the impurities from the steel, but it shall not become so fluid that it could be absorbed in the Tundish holes, because in this way it might be driven into the mould, when the bath level in the Tundish decreases; - the covering compound shall not form a hard crust that could clog the monoblocks and it might make temperature measurement difficult. [5] A number of 5 mixing formulae were experimented, whose chemical composition

There have been a number of reported studies on the laser welding of wrought aluminium alloys.
This is due to the modification effect of strontium which increases the number of nucleation sites for the eutectic Si.
After the inspection of the grain structure in the fracture surface, it was also observed that the mode of fracture was ductile dimple fracture.

It can decrease the sensibility to the degree of uniformity of the abrasive grain-size distribution by its 'trap' effect and the extensive introductions are given in Ref. [1].
abrasive particles bond agent pore particle wall number 738 4 d [µm] 5~17 - Density[kg·m -3] 2970 - kn[N·m -1] 5.0×106 1.0×107 Ks[N·m -1] 1.0×106 1.0×107 µ 0.5 0.5 porosity 0.22 - pb_kn [N·m -3] 1×109 ~1×1012 - Fig. 1 Structure of SAGP Table 1 Model parameters The PFC Analysis The PFC model of SFAP.
Acknowledgment This project is supported by National Science Foundation of China (Granted number 50535040).

However, the joining of austenitic and ferritic stainless steels involves challenges such as coarsening of grains and loss of mechanical properties on ferritic side [12].
The total number of combination of parameters obtained are (factors)leveli.e, 33.
Table 2 Combination of parameters by L9 Orthogonal approach Weld Number Welding Current I (Ampere) Welding speed Vs (mm/min) Gas flow rate G (Litre/min) 1 135 105 5 2 135 110 10 3 135 115 15 4 140 105 10 5 140 110 15 6 140 115 5 7 145 105 15 8 145 110 5 9 145 115 10 TIG Welded Samples The TIG welding is one of the most important proposed clean welding method for the attainment of good quality welds in some critical dissimilar materials like AISI 304L and 430.

Although the cost of the cutting tool makes up only part of the total cost for producing one component piece (10 % to 15 %), they have a significant impact particularly on the following: cutting process TW, machine stand time, number of required operations, period for which the components must stay within the company and number of cutting tools.
Have identified areas consist of a continuous plastically deformed microstructure and the depth below the machined surface, which was localized plastic deformation in the austenite grains isolated. 3.