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Toughening Mechanisms of Lamellar TiAl Alloys Containing B2 Phase at Room Temperature
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Toughening Mechanisms of Lamellar TiAl Alloys Containing B2 Phase at Room Temperature
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National Natural Science Foundation of China (51264010, 51202095); Open Research Project of the State Key Laboratory of Millimeter Waves (K201218); China Postdoctoral Science Foundation (2012M511458); Department of Educational, Science & Technology, Human Resources & Social Security of Jiangxi Province (GJJ12366, 20122BAB216013, 20121BBE50027, [2012]195)

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    摘要:

    通過(guò)三點(diǎn)彎曲斷裂和卸載試驗(yàn)對(duì)含B2相TiAl金屬間化合物的韌化機(jī)理進(jìn)行研究，通過(guò)雙缺口四點(diǎn)彎曲試驗(yàn)確定解理斷裂的臨界事件。通過(guò)掃描電子顯微鏡和能譜分析觀察斷口形貌和裂紋擴(kuò)展路徑。結(jié)果表明：(1) 3PB試驗(yàn)的載荷位移曲線(xiàn)為線(xiàn)性關(guān)系，B2相對(duì)裂紋的起裂無(wú)影響；(2) 塊狀B2相對(duì)裂紋的擴(kuò)展有一定的阻礙作用，裂紋遇到B2相停止或繞過(guò)B2相繼續(xù)擴(kuò)展；(3) 解理斷裂的臨界事件為沿缺口根部開(kāi)裂裂紋的擴(kuò)展，穿層斷裂對(duì)臨界事件起著重要的作用；(4) 這種材料的韌化機(jī)理包括：塊狀B2相韌化，裂紋偏轉(zhuǎn)，穿層斷裂和剪切韌帶韌化

    Abstract:

    Three point bending (3PB) fracture tests and unload tests of lamellar TiAl alloys containing B2 phase were carried out to investigate the toughening mechanisms of the TiAl alloy. Double notched 4PB tests were used to evaluate the critical event of cleavage fracture of this alloy. To observe the morphology of fracture surface and crack path, scanning electron microscope (SEM) and energy spectrum analyses were also carried out. The results reveal the following aspects: (1) The load-displacement curve of 3PB fracture tests presents linear elastic relationship, and B2 phase has no effect on the crack initiation. (2) B2 phase is an obstacle to the crack propagation. The crack is arrested by B2 phase at low applied load and bypasses the B2 phase by skipping over B2 phase or crosses B2 phase at high applied load. (3) The critical event of the cleavage fracture of a notched specimen is a propagation of the nucleated interlamellar crack at the notch root. And trans-lamellar propagation is the key factor affecting the whole process of cleavage fracture. (4) The toughening mechanisms of the current alloy include B2 phase toughening, crack deflection, shear ligament toughening and trans-lamellar toughening

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王 哲,曹 睿,陳劍虹,張 繼. Toughening Mechanisms of Lamellar TiAl Alloys Containing B2 Phase at Room Temperature[J].稀有金屬材料與工程,2014,43(3):540~543.[Wang Zhe, Cao Rui, Chen Jianhong, Zhang Ji. Toughening Mechanisms of Lamellar TiAl Alloys Containing B2 Phase at Room Temperature[J]. Rare Metal Materials and Engineering,2014,43(3):540~543.]
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  • 收稿日期:2013-03-05
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  • 在線(xiàn)發(fā)布日期: 2014-06-27
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