Acta Metall Sin  1998, Vol. 34 Issue (1): 39-44    DOI:

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DEFORMATION BEHAVIOR OF γ-TiAl SINGLE CRYSTALS AT DIFFERENT TEMPERATURES

WU Donghai;HU Gengxiang (Department of Materials Science; Shanghai Jiaotong University; Shanghai 200030)INUI Haruyuki; YAMAGUCHI Masaharu (Kyoto University; Kyoto 606-01; Japan)

WU Donghai;HU Gengxiang (Department of Materials Science; Shanghai Jiaotong University; Shanghai 200030)INUI Haruyuki; YAMAGUCHI Masaharu (Kyoto University; Kyoto 606-01; Japan). DEFORMATION BEHAVIOR OF γ-TiAl SINGLE CRYSTALS AT DIFFERENT TEMPERATURES. Acta Metall Sin, 1998, 34(1): 39-44.

Abstract References Related Articles Recommended Metrics Download:  PDF(438KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The plastic deformation behavior of γ-TiAl(Ti-56%Al) single crystals was studied by compression in the temperature range of-196-1100℃ along seven crystal orientations: [001],[152] , [021], [233], [191], [251] and [110]. The profile of the yield stress-temperature curves measured can be divided into three parts: in the temperature range of-196-600℃, the yield stress first decreases rapidly with increasing temperature followed by a plateau above room-temperature.The yield stress then shows an anomalous increase with increasing temperature above 600 ℃and reaches a peak between 700-1000℃, depending on crystal orientations. Above the peak temperature, the yield stress again decreases rapidly with increasing temperature. Below the peak temperature, the deformation mode is {111}<110] ordinary slip only for [021] orientation and {111}<101] superlattice slip for other orientations. Above the peak temperature, the deformation modes are: {111}<112] twinning, {111}<112] superlattice slip or ordinary slip. The planes for ordinary slip can be {111}, {110) or (001), depending on crystal orientations. Key words:  γ-TiAl single crystal      crystal orientation      critical resolved shear stress      anomalous yield behavior      Received:  18 January 1998      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1998/V34/I1/39 1 Yamaguchi M, Umakoshi Y.Proa Mater Sci,1990; 34:1 2 Paidar V, Pope D P.Vitek V. Acta Metall,1984; 32: 435 3 Takeuchi S.Kuramoto E.Acta Metall,1973; 21: 415 4 Hirsch P B Philos Mag.1992;A65: 569 5 Kawabata T.Kanai T,Izumi O.Acta Metall Mater.1985;38: 1355 6 Kawabata T,Abumiya T,Kanai T,Izumi O.Philos Mag,1994; A69: 681 7 Hug G, Loiseau A,Lasalmonie A.Philos Mag,1986: A54: 47 8 吴东海。上海交通大学博士学位论文,1996(WU Doughal.Ph.D.Thesis in Shanghai Jiaotong University.1996) [1] LIU Jinlai, YE Lihua, ZHOU Yizhou, LI Jinguo, SUN Xiaofeng. Anisotropy of Elasticity of a Ni Base Single Crystal Superalloy[J]. 金属学报, 2020, 56(6): 855-862. [2] SUN Heng,LIN Xiaoping,ZHOU Bing,ZHAO Shengshi,TANG Qin,DONG Yun. Microstructures and Tensile Deformation Behavior of Directionally Solidified Mg-xGd-0.5Y Alloys[J]. 金属学报, 2020, 56(3): 340-350. [3] HU Bin,LI Shusuo,PEI Yanling,GONG Shengkai,XU Huibin. Influence of Small Misorientation from <111> on Creep Properties of a Ni-Based Single Crystal Superalloy[J]. 金属学报, 2019, 55(9): 1204-1210. 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[8] ZHANG Guangping;WANG Zhongguang (State Key Laboratory for Fracture and Fatigue of Materials; Institute of Metal Research; Chinese Academy of Sciences;Shenyang 110015). EFFECTS OF CRYSTAL ORIENTATION AND LOAD MODE ON FATIGUE BEHAVIOR IN Ni_3Al ALLOY SINGLE CRYSTALS[J]. 金属学报, 1997, 33(10): 1009-1014. [9] HE Guo;LI Jianguo;MAO Hiemin;FU Hengzhi(Northwestern Polytechnical University;Hi'an 710072)(Manuscript received 1994-09-13.in revised form 1995-03-13). INFLUENCE OF CRYSTAL ORIENTATION ON THE PRIMARY DENDRITE ARM SPACING OF A SINGLE CRYSTAL SUPERALLOY[J]. 金属学报, 1995, 31(7): 309-314. [10] YUE Zhufeng;ZHENG Changqing(Northwestern Polytechnical University;Xi'an)(Manuscript received 2 April;1993;in revised form 24 September;1993). MICRO-MECHANICAL ANALYSIS OF THERMAL MISFIT OF SINGLE CRYSTAL Ni-BASE SUPERALLOY[J]. 金属学报, 1994, 30(3): 124-132. [11] XIA Yuebo; ZHANG Tianyi (State Key Laboratory for Fracture and Failure of Materials; Institute of Metal Research; Academia Sinica; Shenyang) DENG Jun (Shenyang Polytechnical University). EFFECT OF ORIENTATION ON STRESS RESPONSE, FRICTION STRESS AND BACK STRESS DURING CYCLIC DEFORMATION IN AI SINGLE CRYSTALS.[J]. 金属学报, 1992, 28(8): 42-48. [12] JIN Nengyun Shanghai Jiaotong University. CYCLIC DEFORMATION OF FCC CRYSTALS AND ITS DISLOCATION INTERACTION MODEL Ⅰ. CYCLIC DEFORMATION OF COPPER SINGIE CRYSTALS[J]. 金属学报, 1988, 24(5): 299-310. No Suggested Reading articles found! Viewed Full text Abstract Cited   Shared      Discussed