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變形溫度對TC11鈦合金超塑性的影響
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江西省自然科學(xué)基金(2007GQC1575)；江西省教育廳科技項目(GJJ08203)；江西省材料科學(xué)與工程研究中心預(yù)研基金資助項目(ZX200601002)


Effect of Deformation Temperature on the Superplasicity of Titanium Alloy TC11
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    摘要:

    通過高溫拉伸試驗研究TC11鈦合金在應(yīng)變速率0.001 s-1、變形溫度810~1050 ℃的超塑性變形行為，并用金相顯微鏡和透射電鏡對變形試樣的微觀組織進行觀察和分析。結(jié)果表明，在β單相區(qū)，TC11鈦合金不能呈現(xiàn)超塑性；而在α+β兩相區(qū)的810~980℃溫度范圍內(nèi)，TC11鈦合金呈現(xiàn)出超塑性，且最佳溫度在900 ℃附近，其最大延伸率為595%，此時的超塑性變形過程中有晶內(nèi)變形、界面滑動、動態(tài)再結(jié)晶或擴散蠕變的參與，且界面滑動出現(xiàn)在α/β相界面。α相和β相的相對含量對超塑性有較大的影響，初生相含量在70%附近時對應(yīng)著TC11鈦合金的最佳超塑性

    Abstract:

    The superplastic deformation behavior of titanium alloy TC11 has been investigated in the temperature range of 810~1050 ℃ at the strain rate of 0.001 s-1 by tensile tests at high temperature, and the microstructures of samples deformed have been observed and analysed by metallographic microscope and transmission electron microscope. The results showed that the titanium alloy TC11 would not exhibit superplasicity in the b phase field, but exhibit in the temperature range of 810~980 ℃ in the a+b phase field with an optimal deformation temperature of near 900 ℃ and maximum elongation of 595%. The intracrystalline deformation, interface sliding, dynamic recrystallization or diffusion creep take part in the superplastic deformation at 900 ℃, and the interface sliding appears at a/b phase interface. The relative content of a and b phases has a heavy effect on the superplasicity and the titanium alloy TC11 exhibits an optimal superplasicity when the content of primary a phase is about 70%.

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李 鑫,魯世強,王克魯,丁林海.變形溫度對TC11鈦合金超塑性的影響[J].稀有金屬材料與工程,2009,38(11):1920~1923.[Li Xin, Lu Shiqiang, Wang Kelu, Ding Linhai. Effect of Deformation Temperature on the Superplasicity of Titanium Alloy TC11[J]. Rare Metal Materials and Engineering,2009,38(11):1920~1923.]
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  • 收稿日期:2008-10-30
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