Flow Stress Behaviors Under Hot Compression And Rolling Technology Of Al-5Fe-Based Alloy

Al₃Fe intermetallic compound has good heat resistance, wear and corrosion resistance. According to the Al-Fe alloy billet characteristics, through the refinement of the Al₃Fe rolling phase to getting a sort of a heat-resistant aluminum alloy plate, a set of rolling technology is designed. In order to further optimize the Al-Fe alloy plate preparation process, hot compression deformation behavior of the Al-Fe alloy has been studied, for formulate a reasonable process provide the basis for rolling.The flow stress behavior of Al-Fe alloy under the conditions of the strain rate range from 0.01s^-1 to 10s^-1 and the temperature range from 783K to 693K was studied on Gleeble-1500 thermal-mechanical simulator. The results indicated that the rheologic feature of steady-state is significant; the flow stress is sensitive to strain rate and temperature. The relationship among the analytical peak stress of the true stress-strain curve, deformation temperature and strain rate has been obtained through this experiment. The rheologic action of Al-Fe alloy plastic yield at high temperature has been described by Zener-Hollomon parameter of Arrhenius item. The alloy true stress-strain equation has the formation ofThe result of the study shows that: the effect of crushing on iron-rich phase in Al-Fe alloy is remarkable by rolling technology. After roll forming, iron-rich phase size representing a decrease of 600% from solid-state extrusion, can be reduced to 15μm 1μm below, and Uniformly distributed edges and corners to be passivated. The basic matrix grain size can be controlled at below 10μm. The tensile strength of the plates at room temperature can be maintained at 350MPa. When the temperature was increased to 150℃and 200℃, the tensile strength of the plates were 335MPa and 300MPa. The tensile strength of the plates at 300℃only reached 60% of room temperature, were 172MPa. The plate could have be at stabilized at range with good low-temperature thermal stability, when it was stay at 80℃environment and keep for a long time ,the tensile strength were 275 MPa, although the decrease in performance.