فهرس المقالات microporosity حرية الوصول المقاله صفحة الملخص نص كامل 1 - Influence of Withdrawal Rate on As-Cast Microstructure and Stress-Rupture Life of Directionally Solidified Rene80 Superalloy sobhan Rajabi nejad Masumeh seifollahi seyed mahdi Abbasi Seyed Mahdi Ghazi mirsaeed