本文選題：鈦合金 + 織構(gòu)�。� 參考：《稀有金屬材料與工程》2017年10期

【摘要】：利用X射線衍射技術(shù)對冷軋制備的TA18鈦合金航空管材沿壁厚內(nèi)、中、外3層的織構(gòu)進行測定與分析,還測試了由織構(gòu)決定、且能反映管材各向異性特性的收縮應變比(contractile strain ratio,CSR)。結(jié)果表明:管材織構(gòu)強度沿層深會形成較大的梯度變化,通過晶體取向分布函數(shù)(ODF)的峰值密度顯示的織構(gòu)梯度變化大于17%,特別是各層的織構(gòu)的類型也存在很大差別。僅采用減薄展平法取管材中層織構(gòu)評定管材性能時,即使織構(gòu)強度等級較高,也會出現(xiàn)CSR下降的情況,原因在于,管材存在沿層深不一致的織構(gòu)分布,出現(xiàn)有利的徑向織構(gòu)和不利的切向織構(gòu)共存的情況,不利織構(gòu)分數(shù)過大,將導致其CSR值降低。確定織構(gòu)沿層深的分布為進一步預測并改進管材的力學性能提供參考,并為改善生產(chǎn)工藝提供依據(jù)。
[Abstract]:The texture of the inner, middle and outer layers of TA18 titanium alloy aeronautical pipe prepared by cold rolling was measured and analyzed by X-ray diffraction technique. The contractile strain ratio, which is determined by texture and can reflect the anisotropy of the tube, was also tested. The results show that the texture strength of the pipe varies greatly along the depth of the layer, and the change of texture gradient is greater than 17 by the peak density of the crystal orientation distribution function (ODF), especially the type of texture of each layer is also very different. When using thinning and flattening method to evaluate the properties of the pipe, even if the texture strength grade is higher, the CSR will decrease. The reason is that the pipe has different texture distribution along the layer depth. The coexistence of favorable radial texture and unfavorable tangential texture will lead to the decrease of CSR value if the unfavorable texture fraction is too large. The distribution of texture along the layer depth provides a reference for further prediction and improvement of the mechanical properties of the pipe and provides a basis for improving the production process.
【作者單位】： 西安交通大學;北京航空材料研究院;
【基金】：國家自然科學基金委員會與中國民用航空局聯(lián)合資助項目(61179068) 航空科學基金資助項目(JZ20141106)
【分類號】：TG146.23;TG335

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