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TiC／Ti復(fù)合材料動態(tài)拉伸的裂紋形成及擴(kuò)展機(jī)制
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TB331

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江蘇科技大學(xué)先進(jìn)焊接技術(shù)省級重點實驗室資金資助


Crack Forming and Propagation Mechanisms Tension of TiC/Ti Composites during Dynamic
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    摘要:

    采用熔鑄法制備的原位自生TiC／Ti復(fù)合材料，在SEM中靜載動態(tài)拉伸，原位觀察和研究了裂紋的萌生及擴(kuò)展機(jī)制。結(jié)果表明，TiC顆粒表面及應(yīng)力集中處最容易萌生微裂紋；在不同位置萌生的微裂紋中，處于有利位向的微裂紋不斷擴(kuò)展，并與周圍的裂紋連接形成主裂紋；主裂紋擴(kuò)展主要是通過自身擴(kuò)展與周圍的裂紋連接相結(jié)合的方式進(jìn)行，當(dāng)裂紋擴(kuò)展受阻時，裂紋前方顆粒處形成新的裂紋或基體中形成塑性坑，并通過擴(kuò)展相互連接；裂紋擴(kuò)展到一定程度后，試樣全面失穩(wěn)而迅速斷裂。根據(jù)試驗觀察與分析建立了裂紋萌生與擴(kuò)展模型。

    Abstract:

    The in-situ TiC particles reinforced Ti-matrix composites were fabricated by melting-casting. The mechanisms of crack forming and propagation were investigated during dynamic tension under static load by SEM. The results showed that microcracks easily appeared on the surface of TiC particles with stress concentration. The microcracks in advantageous orientation propagated continuously mainly by self-propagation and combination with ambient cracks among the micocracks in different position, forming the dominant crack by connection with surrounding cracks. When the crack propagation was baffled, new cracks formed on the front TiC particle in front of cracks or plastic pits formed in the matrix, and the cracks were connected with each other by propagating, so that the samples losed the stability and fractured rapidly after the cracks propagated to some extent. A model of crack forming and propagation was established according to the results.

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金云學(xué) 李俊剛. TiC／Ti復(fù)合材料動態(tài)拉伸的裂紋形成及擴(kuò)展機(jī)制[J].稀有金屬材料與工程,2007,36(5):764~768.[Jin Yunxue, Li Jungang. Crack Forming and Propagation Mechanisms Tension of TiC/Ti Composites during Dynamic[J]. Rare Metal Materials and Engineering,2007,36(5):764~768.]
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  • 最后修改日期:2006-04-20
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