通过对直缺口近全层组织的扫描电镜原位拉伸实验以及相应的断裂表面观察,结合有限元计算了TiAl基合金近全层组织拉伸的断裂机理.研究表明:许多裂纹在塑性变形前沿着层间起裂和扩展,断裂过程的驱动力是拉应力.在直缺口试样中,许多裂纹直接起裂于缺口根部,并且沿着层间扩展.随着拉应力的增加,主裂纹和新裂纹也可以通过障碍晶粒的穿层解理断裂来连接.通过有限元计算得沿层断裂强度大约为50 MPa,穿层断裂强度大约为120 MPa.
参考文献
| [1] | KimY W .[J].Journal of The Minerals,Metals & Materials Society,1994,7:30-39. |
| [2] | Huang S C .[J].Metallurgical and Materials Transactions,1992,23A:375-386. |
| [3] | Dennis;Dimiduk M;Hazzledine et al.[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1998,29A(02):37-47. |
| [4] | Liu C T;Schneibel J H;Maziasz P J .[J].Intermetallics,1996,4:429-440. |
| [5] | Chan K S;Kim Y W .[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1992,23A:1663-1677. |
| [6] | Inui H;Oh M H;Nakamura A;Yamaguchi M .[J].Acta Materialia,1992,40(11):3095-3104. |
| [7] | Lu Y H;Zhang Y G;Chen C Q;Kim Y M.Gamma Titanium Aluminides 1999[A].New York:MineralsMetals & Materials Society:595-600. |
| [8] | Chan K S .[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1993,24A(03):569-583. |
| [9] | Chan K S;Onstott J;Kumar K S .[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,2000,31A(06):71-80. |
| [10] | Hazzledine P M;Kad B K .[J].Materials Science and Engineering,1995,A192-193:340-346. |
| [11] | Huang Tang;Beuth J K;Milke J G;Biery N E.Hemker K J.Proc. Structural Intermetallics 2001[A].Philadelphia:TMS,2001:355-362. |
| [12] | 陆永浩,张永刚,乔利杰,王燕斌,陈昌麒,褚武扬.全层状TiAl基合金断裂机制原位观察[J].稀有金属材料与工程,2001(01):15-18. |
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