Search results

Introduction AA7020 is a precipitation hardened Al-Zn-Mg alloy being used in the military and aerospace applications in view of its high strength and excellent weldability [1].
Cu, 0.35 Si, 0.3 Cr, 0.5 Mn and Al- Bal.
The SSRT data such as UTS, %El. and SCC index (SI) measured from the plots are summarized in the table given below.
Strain plots obtained for the coated and uncoated AA7020 alloy in 3.5% NaCl solution Sample Environment UTS (MPa) % El.
Lashermes, Corros.Sci. 25 (1985), p.999-1018 [2] A.L.

[2] Walid El-Khattam, Y.G.
Atwa, E.F.El-Saadany, M.
[6] Sérgio Haffner, Luís Fernando Alves Pereira, Luís Alberto Pereira, and et al.
[7] Sérgio Haffner, Luís Fernando Alves Pereira, Luís Alberto Pereira, and et al.
[14] Meng Xiao_fang, Piao Zai_lin, Xie Dong_guang, and et al.

Introduction Self-assembly synthesis of metal nano-particles has attracted great interest due to its unique properties and potential applications, especially in biotechnology, catalysis, magnetic, optoelectronics et al. [1-4].
Kim et al. [9], the size of nano-particles could be adjust by calcinated temperature.
Third, the minimum particle size would be limited by the size dependent energy, as the theory of Leff et al. which discussed about the size of Au nano clusters formed by thiol capped Au atoms is limited in a range [13].
El-Sayed: J.
El-Sayed: J.

The high strain rate properties were also studied by Huh et al. for accurate crashworthiness of vehicles[5].
Table.1 Chemical composition of 0.08mm SPCC (wt%) C Si Mn S P Al N 0.024 0.01 0.23 0.0073 0.006 0.036 0.0045 The continuous annealing process was simulated by using the CCT-AY-Ⅱheat treatment system for thin steel sheet.
MnS AlN AlN MnS MnS AlN (a) El Wt% At% (b) El Wt% At% Al K 55.50 49.78 S K 23.19 35.05 N K 23.87 41.29 Mn K 53.23 46.96 Fe K 20.63 8.922 Fe K 23.58 17.98 Fig.4 TEM micrographs showing presence of different types of precipitates (a) AlN; (b) MnS; (c) precipitations in cold-rolled sheets; (d) precipitations in annealed sheets Fig.5 (a) Φ2 = 45° sections of ODF of the annealed steels; (b) EBSD maps reconstructed from all Euler As is known, AlN precipitation is principal influence factor for the texture of SPCC steel.

and for e > eL, (3) From the equations above, one can clearly see that if the the initial tangent modulus Eit and the strain at peak stress e0 are known for a given concrete compressive strength fc¢, the complete stress-strain curve for unconfined HSC under uniaxial compression can be obtained.
Recently, a empirical model for Eit has been proposed by Lu et al. [4] as shown in Eq. (4)
Some available analytical models for predicting peak strain Researchers Equations Tomaszewicz [5]; NS 3473 [6] CEB-FIP [1] de Nicolo et al. [7] Wee et al. [8] ACI [9] Table 2.
[8] etest/e0p NS 3473 [6] etest/e0p de Nicolo et al.[7] etest/e0p Present etest/e0p fc' (MPa) etest (´10-6) Wee et al
As can be observed from Table 2, generally, NS 3473[6] (Tomaszewicz [5]) and de Nicolo et al. [7] overestimate the peak strain when compared with the test data, while CEB-FIP [1], Wee et al. [8] and ACI [9] provide conservative predictions.

According to the “iodide- induced mechanism” of Ha et al.[27], the authors proposed a possible mechanism, involving inhibition of {111} facets by strongly bonded halide ions, which increases in the order Cl- < Br- < I-.
Cheng et al [28] also observed similar aggregated gold structures in their study on the effect of KI on the morphology of AuNPs prepared by the citrate reduction method, the results further proved that halide ions have a dramatic formation of nanoparticle superstructures.
[2] Jain PK, Lee KS , El-Sayed IH , El-Sayed MA, Calculated absorption and scattering properties of gold nanoparticles of different size, shape, and composition: applications in biological imaging and biomedicine, J.
[8] Nikoobakht B, El-Sayed M A, Preparation and growth mechanism of gold nanorods (NRs) using seed-mediated growth method, Chem.
[19] El-Sayed MA.

Takagi et al.
Koledov et al.
Kamnma el al., Phase transitions in Ni2+xMn1–xGa with a high Ni excess, Phys.
Jalkanen et al., First-principles calculations of spin spirals in Ni2MnGa and Ni2MnAl, Phys.
Town el al.

Chukwu et al. conducted a rubber formulation study utilizing 5 phr ZnO and 6 phr stearic acid [44].
According to Delchev et al., additives added to rubber compounds can increase elongation at breaks.
El Sabbagh, O.S.
El Kinawy and S.M.
El Sawy, Material and Design 32, 2835-43 (2011)

The results in Fig. 2 indicate that the YS, UTS and %EL of 304 LN SS at 283 K are higher than that of the specimen tested at 223 K.
But the increase in %EL with lowering of temperature is in contradiction to common expectation.
Grosse et al. [31] have shown that in the low cycle fatigue regime, the volume fraction of DIM is insensitive towards straining frequency.
The observed nature of increase in er with sa is in good agreement with the trend of results reported by Kang et al. [36] for 304LN stainless steel and that by Gupta et al. [37] for SA333 Gr. 6 piping steel.
This relaxation is further followed by the decrease in effective ΔK and a lowering of crack growth rate as reported by Biswas et al. [6].

Sci., Hanyang University, Ansan, Kyunggi-Do, 425-791, Korea Keywords: Cryogenic temperature, Ultrafine grain, Annealing, Al alloys.
In the present work, it is attempted to investigate the microstructural evolution of 5083 Al alloy rolled at cryogenic temperature during annealing and the effect of annealing temperature on mechanical properties of 5083 Al alloy, compared with those rolled at room temperature.
Results and Discussion Mechanical properties of 5083 Al alloy rolled at cryogenic and room temperatures are shown in Fig. 1.
Fig.1 Mechanical properties of 5083 Al alloy, Fig.2 TEM micrograph of 5083 Al alloy, rolled at cryogenic and room temperatures.
Fig.3 The effect of annealing temperature Fig.4 TEM micrograph of 5083 Al alloy, on mechanical properties of 5083 Al alloy, cryo-rolled with 85% reduction and annealed rolled at cryogenic and room temperatures.