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超大擠壓變形對(duì)鈦合金增強(qiáng)鎂基復(fù)合材料顯微組織的影響
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TB331

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國(guó)家自然科學(xué)基金（50471032）及科技部重大項(xiàng)目前期專項(xiàng)（02061005）資助


Effect of Ultra-Deformation on the Microstructures of Titanium Alloy Reinforced Magnesium Matrix Composites
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    摘要:

    采用粉末冶金法制備了鈦合金（Ti-6Al-4V）（質(zhì)量分?jǐn)?shù)，下同）顆粒增強(qiáng)MB15鎂基復(fù)合材料，經(jīng)225：1的超大比熱擠變形后，借助光學(xué)顯微鏡（OM）、掃描電鏡（SEM）和透射電鏡（TEM）對(duì)其顯微組織進(jìn)行了研究。結(jié)果表明：鈦合金顆粒沿?cái)D壓方向因塑性變形而被拉長(zhǎng)，其增強(qiáng)效果得到提高；超大比熱擠變形能夠顯著細(xì)化基體晶粒，并提高復(fù)合材料的組織均勻性；此外，原鎂粉表面的氧化膜經(jīng)超大比變形后得到了有效的碎化和分散，具有一定的彌散強(qiáng)化效果，因此可充當(dāng)粉末冶金制備鎂基復(fù)合材料的輔助增強(qiáng)相。

    Abstract:

    Magnesium matrix composite reinforced by titanium alloy (Ti-6Al-4V) particulate was fabricated by powder metallurgy route. The samples of composite were hot-extruded with an ultra-deformation ratio of 225:1. The microstructures of extruded samples were investigated using optical microscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results showed that the Ti-6Al-4V particulates were apparently elongated along the extrusion direction, thus increased its reinforcing effect on the matrix. The ultra-deformation could markedly decrease the grain sizes of the composite matrix, and greatly improve the homogeneity of microstructures when compared with a lower ratio of extrusion deformation; in addition, the oxide layers on the surface of original Mg particles were effectively broken and dispersed randomly in the vicinity of Mg-Mg interfaces. It produced an oxidedispersion-strengthening (ODS) effect, further reinforced the matrix as a kind of secondary reinforcement.

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郗雨林 柴東朗 王耀瑋.超大擠壓變形對(duì)鈦合金增強(qiáng)鎂基復(fù)合材料顯微組織的影響[J].稀有金屬材料與工程,2007,36(5):769~773.[Xi Yulin, Chai Donglang, Wang Yaowei. Effect of Ultra-Deformation on the Microstructures of Titanium Alloy Reinforced Magnesium Matrix Composites[J]. Rare Metal Materials and Engineering,2007,36(5):769~773.]
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  • 最后修改日期:2006-05-20
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