【摘要】 采用电导率、显微硬度、扫描电子显微镜(SEM)和透射电子显微镜(TEM)研究Al-0.30Zr与Al-0.30Zr-0.08Y合金的微观组织与性能。铸态Al-Zr-Y合金中微米尺度初生Al3Y相通过共晶反应在晶内和晶界上同时生成。在Al-Zr-Y合金中,Y明显加速了Al3Zr(L12)的析出动力学。由于较大体积Al3(Zr,Y)析出相的生成,Al-Zr-Y合金的电导率明显高于Al-Zr合金的。在Al-Zr-Y合金中观察到了高密度的弥散球状L12结构Al3(Zr,Y)析出相。Al-0.30Zr-0.08Y合金具有比Al-0.30Zr合金更强的抗再结晶能力。更多还原

【Abstract】 Microstructure and properties of Al-0.30 Zr and Al-0.30Zr-0.08Y(mass fraction, %) alloys were investigated by electrical conductivity measurements, microhardness tests, scanning electron microscopy(SEM) and transmission electron microscopy(TEM). Micron-sized primary Al3 Y phases form within grains and at grain boundaries simultaneously as product of eutectic reaction in as-cast Al-Zr-Y alloys. The addition of Y obviously accelerates the precipitation kinetics of Al3Zr(L12) in Al-Zr-Y alloys. The Al-Zr-Y alloys exhibit greater electrical conductivity during aging due to formation of increased volume fractions of Al3(Zr,Y) precipitates. In ternary Al-Zr-Y alloys, spheroidal L12-structured Al3(Zr,Y) precipitates with increased number density and smaller mean radius were observed. The Al-0.30Zr-0.08 Y alloys show improved recrystallization resistance compared with Al-0.30 Zr alloys更多还原