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孿生行為對TA18鈦合金管材塑性的影響
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國家自然科學(xué)基金委員會與中國民用航空局聯(lián)合資助項目(61179068)


Influence of Twinning Behavior on Plasticity of TA18 Titanium Alloy Tubes
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    摘要:

    利用電液伺服材料試驗機(jī),對直徑為Φ16的TA18(Ti-3Al-2.5V)鈦合金管材試樣分別在–60,25,100,200,300和350 ℃下進(jìn)行了靜態(tài)拉伸試驗,并結(jié)合TEM觀察TA18鈦合金管材在高低溫下的顯微組織。結(jié)果表明,TA18鈦合金管材的強(qiáng)度和塑性均隨溫度的升高而降低;通過TEM觀察,在–60 ℃拉伸的管材中觀察到明顯的孿生,而在350 ℃拉伸的管材中沒有觀察到孿生現(xiàn)象。結(jié)果表明:孿生對不同溫度下TA18鈦合金管材的塑性變形起著至關(guān)重要的作用。

    Abstract:

    The tensile tests of Ti-3Al-2.5V (TA18) tubes with the diameter of 16 mm by cold rolling were accomplished on an electro-hydraulic servo material testing machine at –60, 25, 100, 200, 300 and 350 oC, respectively. Meanwhile, microstructure of TA18 titanium alloy tubes after fracture was observed by TEM when tests were carried out at different temperatures. The results indicate that the tensile strength and the elongation of TA18 titanium alloy tubes decreases with the rise of temperature. There is a large amount of mechanical twins in the specimens deformed at –60 oC, but they don’t exist at 350 oC. It is concluded that twinning plays an important role in the process of TA18 titanium alloy tubing deformation.

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劉燕平,張 暉,張旺峰,李 艷,王玉會.孿生行為對TA18鈦合金管材塑性的影響[J].稀有金屬材料與工程,2013,42(6):1169~1172.[Liu Yanping, Zhang Hui, Zhang Wangfeng, Li Yan, Wang Yuhui. Influence of Twinning Behavior on Plasticity of TA18 Titanium Alloy Tubes[J]. Rare Metal Materials and Engineering,2013,42(6):1169~1172.]
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  • 收稿日期:2012-06-10
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