通过拉伸、压缩、弯曲实验分析研究了全层(FL)组织TiAl基合金的断裂机制. 研究发现: 拉伸和压缩时材料抵抗裂纹的扩展能力不同, 抗压强度远高于抗拉强度, 这是由于两者的变形及断裂机制不同. TiAl基合金拉伸断裂机制为脆性解理断裂, 压缩变形断裂是剪应力和正应力共同作用下的断裂, 是准解理断裂. TiAl基合金的缺口弯曲断裂方式也为解理断裂, 其断裂过程是先在缺口处产生微裂纹, 一旦裂纹在缺口根部产生, 由于材料已积累足够的能量使得材料快速失稳解理断裂.
参考文献
| [1] | Werwer M;Cornec A.Numerical simulation of plastic deformation and fracture polysynthetically twinned (PST) crystal of TiAl[J].Computation Materials Science,2000(19):97. |
| [2] | Yamaguchi M;Inui H;Yokoshima S;Kishida K Johnson D R.Recent progress in our understanding of deformation and fracture of two-phase and single-phase TiAl alloys[J].Material Science and Engineering,1996(A213):25. |
| [3] | Chan K S;Kim Y M .Effects of lamellar spacing and colony size on the fracture resistance of a full-lamellar TiAl alloy[J].Acta Metallurgica Et Materialia,1995,43(02):439. |
| [4] | Germann L;Banerjee D;Guedou J Y;Strudel J L .Effect of composition on the mechanical properties of newly developed Ti2AlNb-based titanium aluminide[J].Intermetallics,2005,13:920. |
| [5] | Chan K S;Wang P;Bhate N;Kumar K S .Intrinsic and extrinsic fracture resistance in lamellar TiAl alloys[J].Acta Materialia,2004,52:4601. |
| [6] | 陈国良;林均品.有序金属间化合物结构材料物理金属学基础[M].北京:冶金工业出版社,1999 |
| [7] | J. H. CHEN;R. CAO;G. Z. WANG .Study on Notch Fracture of TiAl Alloys at Room Temperature[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,2004(2):439-456. |
| [8] | 曹睿,陈剑虹,张继,王国珍.近全层组织γ-TiAl基合金的室温拉伸断裂机理[J].稀有金属材料与工程,2005(05):696-700. |
| [9] | 曹睿,陈剑虹,张继,王国珍.金属间化合物TiAl合金的缺口断裂机制研究[J].稀有金属,2004(05):894-899. |
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