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新型鋯鈦合金的動態(tài)拉伸力學性能與微觀斷裂機制試驗研究

Tests ofdynamic tensile properties and microscopic fragment mechanism for a new zirconium-titanium alloy

  • 摘要: 采用直接撞擊式Hopkinson拉桿裝置對新型鋯鈦合金材料在動態(tài)沖擊載荷作用下的力學性能進行了試驗研究，得到了典型動態(tài)拉伸真應力-真應變曲線。試驗結(jié)果表明，在室溫、應變率為800~4000s-1的情況下，材料的動態(tài)強度（包含屈服強度σ0.2、抗拉強度σb）、失穩(wěn)應變、伸長率以及應變能密度均隨應變率的增大而增大。采用掃描電子顯微鏡（SEM）對試件斷口進行分析，研究了合金材料在不同應變率狀態(tài)下的失效斷裂特征。結(jié)果發(fā)現(xiàn)，隨應變率的增大，材料的斷裂方式由準解理斷裂變?yōu)轫g性斷裂。

     

    Abstract: Dynamic tension tests were conducted by employing the SHTB(split Hopkinson tension bar)to study the dynamic machanical properties of a new zffconium-titanium alloy. The dynamic mechanical properties of the alloy were determined at high strain rates ranging from 800 S-1 to 4000 S-1 at room temperature. The results show that the mechanical behavior of zffconium-titanium alloy depends on the strain rate, the dynamic strengths(including σ0.2 and σb), the unstable strain, the elongation, and the strain energy density all increase with the increase of the strain rates. The SEM fractographic observation shows that there exists a strain rate dependence of the fracture mode for the alloy sample. At room temperature and 800 S-, the sample is brittle, but its fracture modes changes from a quasi-cleavage one to a ductile one with increased strain rates.

     

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