Effects of Growth Rate on Eutectic Spacing, Microhardness, and Ultimate Tensile Strength in the Al-Cu-Ti Eutectic Alloy

In the present work, dependences of lamellar spacing (lambda), microhardness (HV), and ultimate tensile strength (sigma(UTS)) on growth rate (V) were investigated in the Al-Cu-Ti (Al-33 wt % Cu-0.1 wt % Ti) eutectic alloy. For these purposes, the Al-Cu-Ti eutectic alloy was solidified at a constant temperature gradient of 6.45 K mm(-1) with a wide range of growth rates, from 8.58 to 2038.65 mu m/s. Then, the values of lambda, HV, and sigma(UTS) were measured on the directionally solidified Al-Cu-Ti specimens. The dependences of lambda, HV, and sigma(UTS) on V in the Al-Cu-Ti eutectic alloy were experimentally obtained using regression analysis. The results obtained in the present work were compared with the similar experimental results in the literature.