共搜索到145794条信息，每页显示10条信息，共14580页。用时：0小时0分0秒988毫秒
at room temperature at a constant engineering strain rate of 5×10-4 s-1. The fracture appearance was examined by a Jeol JSM-6460 scanning electron microscope (SEM). 3 Results and discussion Figure 1...% (see Fig. 3), which suggests an enhanced plasticity for the samples with small surface roughness. The fractured specimens were observed under SEM so as to discern the origin of the plasticity......
of 0.01, 0.1, 1 and 10 s-1. The high reduction of the specimens was 60%. The stress-strain curves were automatically recorded by the experimental equipment. 3 Results and discussion 3.1 Influence... the predicted results agree with the experimental results. The plot of experimental value of flow stress and predicted flow stress by ANN model is shown in the Fig. 3. It can be shown......
at a crosshead speed of 0.5 mm/min. The microhardness of the foam samples was measured using a HM-100 Mitutoyo microhardness tester. Each datum reported is an average of five measurements. 3 Results... in Fig. 3. Higher ceramic particle addition resulted in more particle attachment to the strut surface. Using an image analyzer, the area fractions of the ceramic particles are determined to be 1.2%, 2.0......
+ 100 mL glycerol + 1000 mL methanol. The extraction temperature was placed between -3 ℃ and 2 ℃ and the current density was 0.07 A/mm2. Then the extracted powder was observed by SEM and the compositions of these minor phases were investigated via an electron probe micro analyzer (EPMA) and energy dispersive X-ray spectroscope (EDS). All the samples reported here were as-cast. 3 Results......
Received 4 July 2011; accepted 9 October 2011 Abstract: Ageing hardening, microstructure and mechanical properties of Mg-xY-1.5LPC-0.4Zr (x=0, 2, 4, 6) alloys (LPC represents La-based rare earth metal... group (La-Eu), and the Y group (Y and Gd-Lu). The use of rare earths enables both solid solution hardening and precipitation hardening, and the intermetallic compounds exhibit little diffusivity......
). The phase composition was determined with an energy dispersive spectrometer (SEM, S-4700) and the fine microstructure of the joint was analyzed using a transmission electron microscope (Philips CM-12). 3..., as shown in Fig. 3. Fig. 3 Schematic diagram of electron-beam superposition welding The non-centered welding of Cu and Ti with deviation of 0.6 mm inclined toward Cu was firstly conducted......
of the stir zone (SZ) was measured at the cross section and perpendicular to the processing direction using a Vickers indenter with a 0.98 N load for 10 s. 3 Results and discussion Figure 2 shows.... 3 Macro cross-sectional image (a) and optical microstructures of FSPed A356 with SiC particles of TMAZ (RS) (b), SZ (c) and TMAZ (AS) (d) zones marked in Fig. 3(a) The optical macro......
. The needle-like precipitates shown in Fig. 3(c) are mainly η′ phases. After ageing at 160 °C for 1 h, there are no obvious GPI and GPII diffraction features existing in the patterns, as shown in Figs. 4(e...) and (h), which indicates that the η phase is in dominant at this stage. This indicates that the rod-like precipitates and the blocky precipitates shown in Fig. 3(f) are η phases. 4 Discussion 4.1......
strength tests, microhardness distribution of the joint cross-section, and observation of the fracture morphology. 3 Results and analysis 3.1 Joint microstructure The electron-beam-welded GH4169 alloy.... This is because the cooling rate is so rapid that the strengthening-phase particles have no time to aggregate and grow. The weld was examined using XRD, and the results are shown in Fig. 3. XRD, combining......
the microstructures. 3 Results and discussion 3.1 Hardness curves Figure 1 depicts the ageing hardness curves of 2524 alloy aged at 170 °C with and without stress during the ageing process. All of the curves... zones. 3.2.2 Microstructures of peak-aged sample with various stresses The microstructures of peak-aged samples at 170 °C with various stresses (0, 173, 250 MPa) are provided in Fig. 3. The S phases......
