Microstructure and Mechanical Properties of Be_(12)Ti/(Be) and Be_(12)V/(Be) Two-phase Alloys

摘要

In order to impart some room temperature ductility to intrinsically brittle Be_(12)X type intermetallic compounds, two phase alloys involving Be solid solution, hereafter (Be), are prepared in the Be-Ti and Be-V systems and the microstructure-mechanical property relationships are examined. In both alloy systems, Ti or V concentration is preliminary chosen as 3 and 5 at% and the microstructures are observed for as-cast condition as well as hot-rolled conditions by 25 and 50 reductions. The effect of hot-rolling on the two-phase microstructure is found to be moderate even after 50% reduction. However, the room temperature compressive ductility of the alloys with 3at% additions seems to be fairy improved by the hot rolling to be over 4%. Room temperature compressive strength of the alloys ranges from 700 to 850 MPa in both alloy systems and naturally it is higher with 5at% Ti or V than those with 3at%. Compressive 0.2% flow stress at 1273K is less than 100MPa in all he alloys but the alloys are fully ductile at the temperature.