Influence of temperature on tensile behavior and deformation mechanism of Re-containing single crystal superalloy

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• 作者：Jin-lai  ; LIU  ; <sup> ;   ; sup><sup>jlliu@imr.ac.cnsup> ; Jin-jiang  ; YU ; Tao  ; JIN ; Xiao-feng  ; SUN ; Heng-rong  ; GUAN ; Zhuang-qi  ; HU
• 关键词：single crystal superalloy ; tensile behavior ; yield strength ; microstructure
• 刊名：Transactions of Nonferrous Metals Society of China
• 出版年：2011
• 出版时间：July 2011
• 年：2011
• 卷：21
• 期：7
• 页码：1518-1523
• 全文大小：1022 K

文摘

Tensile properties of a Re-containing single crystal superalloy were determined within the temperature range from 20 to 1 100 ¡ãC with a constant strain rate of 1.67¡Á10<sup xmlns="""">?sup> s<sup xmlns="""">?sup>. From room temperature to 600 ¡ãC, the yield strength increases slightly with increasing temperature. The yield strength decreases to a minimum at 760 ¡ãC, while a maximum is reached dramatically at 800 ¡ãC. The elongation and area reduction decrease gradually from room temperature to 800 ¡ãC. Above 800 ¡ãC, the yield strength decreases significantly with increasing temperature. The s="""">¦Ã?phase is sheared by antiphase boundary (APB) below 600 ¡ãC, while elongated SSF (superlattice stacking fault) is left in s="""">¦Ã?as debris. At 760 ¡ãC the s="""">¦Ã?phase is sheared by s="""">a/3?12?superpartial dislocation, which causes decrease of yield strength due to low energy of SSF. Above 800 ¡ãC, dislocations overcome s="""">¦Ã?through by-passing mechanism.