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塑性變形對Mg-Gd-Y-Zr合金析出行為及拉伸斷裂行為的影響
摘要:研究塑性變形對Mg-10Gd-3Y-0.6Zr合金析出行為及拉伸斷裂行為的影響.結果表明:塑性變形引發的晶體缺陷為時效析出提供了更多的形核核心,不僅使β′相的數量增加,還促進晶界、孿晶與基體界面處析出相的生成.析出相數量的增多可有效阻礙拉伸變形過程中的位錯滑移從而強化合金基體,2%變形合金可實現強度與塑性的良好配合.塑性變形量增大,微裂紋在晶界析出相與基體界面處產生并沿晶界擴展,再加之斷口表面平滑刻面的形成導致合金的拉伸性能降低.Abstract:The effects of plastic deformation on precipitation behavior and tensile fracture behavior of Mg-10Gd-3Y-0.6Zr alloy were investigated.The results indicate that more precipitation cores can be provided by the crystal defects caused by the plastic deformation,as well as increasing the amount of β′ phases,and the formation of precipitations at grain boundaries and interfaces between the twins and matrix.Because of an increase in precipitations,the dislocation slipping during deformation process is effectively hindered and the matrix is strengthened,especially for the 2% deformed alloy which can achieve a good combination of strength and ductility.With increasing the plastic deformation,the microcracks occur at the interface between grain boundary precipitations and matrix,and then propagate intergranularly.When intergranular fracture combines with the formation of smoothing facets on the fracture surface,the tensile properties decrease. 作者: 林丹[1] 王磊[1] 劉楊[1] 崔建忠[2] 樂啟熾[2] Author: LIN Dan[1] WANG Lei[1] LIU Yang[1] CUI Jian-zhong[2] LE Qi-chi[2] 作者單位: 東北大學材料各向異性與織構教育部重點實驗室,沈陽,110004東北大學材料電磁過程研究教育部重點實驗室,沈陽,110004 期 刊: 中國有色金屬學報(英文版) ISTICEISCI Journal: Transactions of Nonferrous Metals Society of China 年,卷(期): 2011, 21(10) 分類號: Q946 關鍵詞: Mg-Gd-Y-Zr合金 塑性變形 斷裂行為 拉伸性能 顯微組織 Keywords: Mg-Gd-Y-Zr alloy plastic deformation fracture behavior tensile property microstructure 機標分類號: TG1 TM2 機標關鍵詞: 塑性變形 合金基體 析出行為 拉伸性能 斷裂行為 fracture behavior plastic deformation intergranular fracture 晶界析出相 tensile properties matrix grain boundaries crystal defects grain boundary combination especially interface 形核核心 位錯滑移 數量增加 基金項目: the Program for Changjiang Scholars and Innovative Research Team in Chinese University,the National Basic Research Program of China 塑性變形對Mg-Gd-Y-Zr合金析出行為及拉伸斷裂行為的影響[期刊論文] 中國有色金屬學報(英文版) --2011, 21(10)林丹 王磊 劉楊 崔建忠 樂啟熾研究塑性變形對Mg-10Gd-3Y-0.6Zr合金析出行為及拉伸斷裂行為的影響.結果表明:塑性變形引發的晶體缺陷為時效析出提供了更多的形核核心,不僅使β′相的數量增加,還促進晶界、孿晶與基體界面處析出相的生成.析出相數量的增多...【塑性變形對Mg-Gd-Y-Zr合金析出行為及拉伸斷裂行為的影響】相關文章:
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