CONDITIONS FOR GROWTH OF EXTENDED AL-RICH AL-MN ALLOY SOLID-SOLUTIONS AND AL-AL6MN EUTECTIC DURING RAPID SOLIDIFICATION

Al-Mn alloys containing between 1. 3 and 5. 6 wt% Mn have been rapidly solidified by a modification of the Bridgman crystal growing technique at growth velocity V between 0. 1 and 2 mm/s and a temperature gradient of 10 K/mm. Growth temperatures of the unextended and extended alpha Al solid solutions in alloys containing 1. 3 and 2. 1 wt% Mn and the extended Al-Al//6Mn eutectic containing 3. 2 wt% Mn have been measured as a function of V. These measurements of tip temperature as a function V for the Al-2. 1 wt% Mn alloy are the first reported for a solid solution extended by rapid solidification.