基于γ-基多孪晶晶体微结构及滑移系和形变孪晶空间晶体学位向分布的变形机制,提出了分析晶体屈服应力对外载轴和片层界面夹角间的依赖关系及影响因素的细观力学解析模型.分析了α2相中柱面和锥面上滑移系的启动对多孪晶晶体屈服应力的影响.模拟计算和分析结果表明:当θ=0°时,位错滑移方向跨越片层界面,α2相中柱面滑移系开动;当θ=45°时,滑移方向平行片层界面;当θ=90°方向时,γ相中与片层界面斜交的孪晶开动,而α2相中锥面滑移系由于其临界剪切应力(CRSS)很大而并不开动.多孪晶晶体中孪晶与普通位错、柱面与孪晶及锥面与柱面之间的CRSS比值关系可确定为k:e:z=1:3:18.
参考文献
| [1] | Appel F.;Wagner R. .Microstructure and deformation of two-phase gamma-titanium aluminides [Review][J].Materials Science & Engineering, R. Reports: A Review Journal,1998(5):187-268. |
| [2] | Young-Won K .Ordered intermetallic alloys,part Ⅲ:gamma titanium aluminides[J].Journal of Metallurgy,1994,46:30-39. |
| [3] | Dimiduk D M;Hazzledine P M;Triplicane A et al.The role of grain size and selected microstructure parameters in strengthening fully lamellar TiAl alloys[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1998,29:37-47. |
| [4] | 郑瑞廷,郭富安,张永刚,陈昌麒.双态组织TiAl基合金拉伸塑性的断裂力学[J].中国有色金属学报,2001(z2):114-118. |
| [5] | Fujiwara T;Nakamura A;Hosomi M et al.Deformation of polysynthetically twinned crystals of TiAl with a nearly stoichiometric composition[J].Philosophical Magazine A:Physics of Condensed Matter:Structure,Defects and Mechanical Properties,1990,61(04):591-606. |
| [6] | Kad B K;Dao M;Robert et al.Numerical simulation of plastic deformation and fracture effects in two phase lamellar microstructures[J].Philosophical Magazine A:Physics of Condensed Matter:Structure,Defects and Mechanical Properties,1995,71(03):567-604. |
| [7] | Kad BK.;Asaro RJ.;Dao M. .NUMERICAL SIMULATIONS OF STRESS-STRAIN BEHAVIOR IN TWO-PHASE ALPHA(2)+GAMMA LAMELLAR TIAL ALLOYS[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1995(0):97-103. |
| [8] | Brockman RA. .Analysis of elastic-plastic deformation in TiAl polycrystals[J].International Journal of Plasticity,2003(10):1749-1772. |
| [9] | Schlogl S M;Fischer F D .The role of slip and twinned crystals of TiAl:a micromechanical model[J].Philosophical Magazine A:Physics of Condensed Matter:Structure,Defects and Mechanical Properties,1997,75(03):621-636. |
| [10] | Schlogl S M;Fischer F D .Numerical simulation of yield loci for PSTcrystals of TiAl[J].Materials Science and Engineering A,1997,239-240:790-803. |
| [11] | Yoo M H;Fu C L .Physical constants,deformation twinning,and microcracking of titanium aluminide[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1998,29:49-63. |
| [12] | Yoo MH.;Fu CL.;Zou J. .MECHANISTIC MODELING OF DEFORMATION AND FRACTURE BEHAVIOR IN TIAL AND TI3AL[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1995(0):14-23. |
| [13] | Hu GK. .A METHOD OF PLASTICITY FOR GENERAL ALIGNED SPHEROIDAL VOID OR FIBER-REINFORCED COMPOSITES[J].International Journal of Plasticity,1996(4):439-449. |
| [14] | 苏继龙,胡更开.全片层TiAl合金临界屈服应力及影响因素的细观研究[J].材料科学与工程学报,2003(04):535-538. |
| [15] | Dimiduk D M;Tiplicane A;Parthasarathy H et al.Design-tool representations of strain compatibility and stress-strain relationships for lamellar gamama titanium aluminides[J].Intermetallics,2001,19:875-882. |
| [16] | Inui H;Toda Y;Yamaguchi M .Plastic deformation of single crystals of a DO compound with an off-stoichiometric composition at room temperature[J].Philosophical Magazine A:Physics of Condensed Matter:Structure,Defects and Mechanical Properties,1993,67(06):1315-1332. |
| [17] | Nakano T;Yokoyama A;Umakoshi Y .Effect of Nb addition on the plastic behavior of TiAl crystals containing oriented lamellar[J].Scripta Metallurgica et Materialia,1992,27:1253-1258. |
| [18] | Inui H;Nakamura A;OH M H et al.Deformation structure in Ti-rich TiAl polysynthetically twinned crystals[J].Philosophical Magazine A:Physics of Condensed Matter:Structure,Defects and Mechanical Properties,1992,66(04):557-573. |
| [19] | Inui H;Kishida K;Misaki M et al.Temperature dependence of yield stress,tensile elongation and deformation structures in polysynthetically twinned crystals of TiAl[J].Philosophical Magazine A:Physics of Condensed Matter:Structure,Defects and Mechanical Properties,1995,72(06):1609-1631. |
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