金属学报  2005, Vol. 41 Issue (12): 1243-1248

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γ-TiAl基PST晶体的屈服应力及孪晶影响的细观力学研究

苏继龙;胡更开

福建农林大学机电工程系; 福州350002

MICROMECHANICAL STUDY ON YIELD STRESS AND THE EFFECTS OF TWINNING FOR γ-TiAl-BASED PST CRYSTALS

SU Jilong; HU Gengkai

Department of Mechanics-Electrics ngineering; Fujian Agriculture and Forestry University; Fuzhou 350002

苏继龙; 胡更开 . γ-TiAl基PST晶体的屈服应力及孪晶影响的细观力学研究[J]. 金属学报, 2005, 41(12): 1243-1248 .
, . MICROMECHANICAL STUDY ON YIELD STRESS AND THE EFFECTS OF TWINNING FOR γ-TiAl-BASED PST CRYSTALS[J]. Acta Metall Sin, 2005, 41(12): 1243-1248 .

摘要 参考文献 相关文章 Metrics 全文: PDF(189 KB)   摘要: 基于γ-TiAl基PST晶体的微结构及滑移系和形变孪晶的空间晶体学位向分布的变形机制, 提出了分析PST晶体屈服应力对外载轴和片层界面夹角θ间的依赖关系的细观力学解析模型, 重点考察了PST晶体的微结构和普通位错与形变孪晶的临界分切应力(CRSS)之间的差别对晶体屈服的影响. 结果表明: PST晶体屈服应力σy和外载轴与片层界面之间的夹角θ存在着强烈依赖关系. 在软取向, 变形由普通位错和超位错控制, 变形平行于片层界面; 而在硬取向, 变形由形变孪晶控制, PST晶体的变形为穿过片层界面形式. 在加载角分别为45°, 0°和90°时, 屈服应力间的关系为: σy (45°)<σy (0°)<σy (90°). 同时, 分析了滑移系和形变孪晶的具体开动情况. 关键词 ： γ-TiAl基合金,  PST晶体,  滑移系      Abstract：An analytical micromechanical method, based on the lamellar microstructure and dislocation slip and twinning deformation mechanisms of polysynthetically twinning (PST) crystal, is used to investigate the variation of the yielding stress as function of angle θ between the load axis and the lamellar boundaries for a PST crystal. The sub-domain microstructure of the γ-TiAl-based alloy, PST crystal , slip system phase in PST crystal and the difference of CRSS in ordinary slip and true twinning have been considered in this paper. The results demonstrated that yielding stress relations on loading angle with respect to the microstructure and in soft mode of deformation, which is determined by ordinary dislocation or superdislocation slip systems in γ phase, shear deformation is parallel to the lamellar boundaries; in hard mode of deformation, shear deformation crosses the lamellar boundaries, which is controlled by twinning in the γ phase. In addition, the predicted yield stress values of PST crystals for three loading angles θ=45°, 0°and 90°have the relation as σy(45°)<σy(0°)}<σy(90°). Furthermore, the active slip and twinning systems have also been analyzed systematically. Key words： γ-TiAl-based alloy    PST crystal    slip system 收稿日期: 2005-03-14      ZTFLH:  TH142.2   服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 苏继龙 胡更开 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y2005/V41/I12/1243 [1] Appel F, Wagner R. Mater Sci Eng, 1998; R22: 187 [2] Kim Young-Won. J Met, 1994; 46: 30 [3] Dimiduk D M, Hazzledine P M, Parthasarathy T A. Met- all Mater Trans, 1998; 29A: 37 [4] FujiwaraT, Nakamura A, Hosomi M, Nishitani S R, Shirai Y, Yamaguchi M. Philos Mag, 1990; 61A: 591 [5] Kad B K, Dao M, Asaro J. Philos Mag, 1995; 71A : 567 [6] Kad B K, Dao M, Asaro J. Mater Sci Eng, 1995; A192/193: 97 [7] Brockman R A. Int J Plast, 2003; 19: 1749 [8] Schlogl S M, Fischer F D. Philos Mag, 1997; 75A: 621 [9] Schlogl S M, Fischer F D. Mater Sci Eng, 1997; A239/240: 790 [10] Yoo M H, Fu C L. Metall Mater Trans, 1998; 29A: 49 [11] Yoo M H, Zou J, Fu C L. Mater Sci Eng, 1995; A192/193: 14 [12] Wapole L J. Mech Phys Solids, 1969; 17: 235 [13] Fujiwara T, Nakamura A, Hosomi M H, Nishitani S R, Shirai Y, Yamaguchi M. Philos Mag, 1990; 61A: 591 [14] Inui H, Kishida K, Misaki M, Kobayashi M. Philos Mag, 1995; 72A: 1609 [1] 金浩, 贾清, 刘荣华, 线全刚, 崔玉友, 徐东生, 杨锐. 籽晶制备及Ti-47Al合金PST晶体取向控制[J]. 金属学报, 2019, 55(12): 1519-1526. [2] 陈守东,刘相华,刘立忠,宋孟. Cu极薄带轧制中滑移与变形的晶体塑性有限元模拟*[J]. 金属学报, 2016, 52(1): 120-128. [3] 彭英博,陈锋,王敏智,苏翔,陈光. Ti－45Al－8Nb合金PST晶体片层取向与力学性能的关系[J]. 金属学报, 2013, 49(11): 1457-1461. [4] 刘江涛 王中光 尚建库. [110]和[112]取向β-Sn单晶体的形变行为[J]. 金属学报, 2008, 44(12): 1409-1414. [5] 陆永浩; 张永刚; 乔利杰; 王燕斌; 陈昌麒; 褚武扬 . 全层状结构的γ-TiAl中裂纹扩展的TEM原位观察[J]. 金属学报, 1999, 35(12): 1233-1236 . [6] 林建国;张永刚;陈昌麒. TiAl合金PST晶体高温蠕变特性及蠕变失稳机制[J]. 金属学报, 1998, 34(9): 945-949. [7] 刘毅;林栋梁;汪德宁;陈达;陈世朴;刘治国;孟祥康. PST双相TiAl类单晶室温变形位错特征[J]. 金属学报, 1996, 32(5): 449-455. [8] 刘毅;林栋梁;汪德宁;陈达;陈世朴;刘治国;孟祥康. PST双相TiAl类单晶高温变形位错特征[J]. 金属学报, 1996, 32(5): 456-461. [9] 刘毅;汪德宁;陈达;林栋梁;陈世朴;刘治国. PST双相TiAl类单晶中的微孪晶变形[J]. 金属学报, 1995, 31(9): 393-398. [10] 吴建生;林栋梁. 单晶Nb拉伸、压缩及恒应变疲劳后的滑移系和滑移特征[J]. 金属学报, 1994, 30(5): 187-194. [11] 孙福生;高文;曹春晓. 形变温度对Ti_3Al基合金α_2相滑移系的影响[J]. 金属学报, 1994, 30(11): 507-514. [12] 宁华;张立新. 冷轧Fe-P合金退火过程中磷偏聚行为的金相研究[J]. 金属学报, 1990, 26(5): 34-38. Viewed Full text Abstract Cited   Shared      Discussed