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in α and β phases and can contribute to the effect of solid solution strengthening. Moreover, they also change the phase proportion in the powder metallurgy titanium alloys. Ag is an eutectoid β-stability element, which can strengthen the solid solution. However, when the content of Ag exceeds certain amount, eutectoid transformation takes place between the excessive Ag and Ti, and produces  ......
to the Al-Zn equilibrium diagram (Fig. 6), the Al content around 30% (points A, D in Fig. 7) is in the eutectoid range. MOVAHEDI et al [15] found that the absence of eutectoid phases may be related......
, and development of lamellar eutectoid phase with improved interfaces with SiP particles. Therefore, to take the benefits of high Si content for tribological properties of Zn-Al-Si alloys, it seems...), and stirred zone (SZ). BM microstructure (Figs. 2(a) and (b)) mainly consists of dark gray Al-rich α-dendrites (Zone A), light gray inter- dendritic a+h eutectoid (Zone B), white Cu-rich e-CuZn4 phase (Zone......
and the M5Si3 phases, respectively. With 18%(mole fraction) Si, the Nb67W15- Si18 alloy approaches the eutectic composition, and the microstructure should be composed of eutectoid composition according......
, the α(Al) phases precipitate from the molten liquid and uniformly surround the Zn-rich phases. Figure 3(c) presents the optical micrographs of the Zn-22Al alloy, in which a typical eutectoid... of a Zn-rich phase and Zn-Al eutectic structure, whereas Zn-15Al and Zn-22Al show a typical hyper-eutectic and eutectoid microstructure. 2) A peak value of 88 MPa for the shear strength is obtained......
. [4] ZHU Y H, MAN H C, LEE W B. Exothermic reaction in eutectoid Zn-Al based alloys [J]. Mater Sci Eng A, 1999, 268: 147-153. [5] AASHURI H. Globular structure of ZA27 alloy by thermomechanical and semi... eutectoid alloy AlZn75Cu3Si2 [J]. J Mater Sci Technol, 1990, 6: 125-131. 热处理对ZA27合金组织和性能的影响 刘 洋,李红英,蒋浩帆,鲁晓超 中南大学 材料科学与工程学院,长沙 410083 摘 要:采用X射线衍射(XRD),扫描电镜(SEM)及力学性能表征等手段,研究热处理对ZA27合金组织和性能的影响.结果表明,合......
. MORIZONO et al [6] carried out diffusion bonding of TiAl alloy to eutectoid steel and the shear strength of the joint bonded at 800 °C reached 160 MPa. However, the joint strength reduced while... M, CHIBA A. Diffusion bonding of TiAl alloy to eutectoid steel and its interfacial self destruction behavior [J]. Mater Trans, 2004, 45(2): 527-531. [7] HE P, FENG J C, QIAN Y Y, ZHANG B G......
as Samples 1, 2, 3, 4, and 5, respectively. The microstructures of the alloys consist of α(Al-rich) dendrites, eutectoid α+η (η is Zn-rich) resulted from α-phase decomposition at 275 °C, ε(CuZn4) and Si phases. The higher magnification of ZA38-1.05%Si is shown in Fig. 3(f). Both the α dendrites (Al-based solid solution) and eutectoid α+η show lamellar distribution. The addition of Si has effects......
ternary phase diagrams, as calculated at 624 and 953.73 °C, are shown in Fig. 3(c) and Fig. 3(d), respectively. At 624 °C, an eutectoid reaction (bcc+hcp→hcp+bcc+Ti3Al) occurred at the alloy composition... rate of elements increase. An eutectoid reaction (bcc+hcp→hcp+bcc+Ti3Al) indicates the reactions α→β, β→α and α→α2 at the alloy composition of 90 wt.% Ti, 6 wt.% Al and 4 wt.% V on the Ti-Al-V ternary......
with the addition of Ti. There are continuous Ta phases distributing along the grain boundaries and lamellar eutectoid with nanosized phases appearing inside the grain boundaries. In Figure 3(b), no blocky Ta-rich... of microstructure, the binary equilibrium phase diagrams of Zr-Ta and Zr-Ti are shown in Figure 14. For Zr-30Ta alloy, the eutectoid point is 1000 K, as indicated in Figure 14(a). The α phase can......