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新型輕質(zhì)TiAlBeSc系合金的組織及性能
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中央高?;究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金資助項(xiàng)目(FRF-TP-09-026B)


Microstructure and Performance of TiAlBeSc Alloys with Low Density
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    摘要:

    采用真空電弧爐熔煉制備新型輕質(zhì)TiAlBeSc系合金,最小密度為3.289 g/cm3,利用SEM (EDS)、XRD、納米力學(xué)探針和DTA等分析方法對(duì)合金的顯微組織和熱穩(wěn)定性進(jìn)行分析研究。結(jié)果表明,TiAlBeSc系合金形成穩(wěn)定的金屬間化合物和固溶體,1000 ℃以下加熱過程中不發(fā)生相變,熔點(diǎn)均高于1100 ℃,具有很高的熱穩(wěn)定性。合金元素等摩爾比配比時(shí),25%鈹(原子分?jǐn)?shù))全部固溶于鈧的點(diǎn)陣晶格,L10正方有序結(jié)構(gòu)的TiAl相呈樹枝狀均勻分布于α-Sc的基體上,硬度高達(dá)7330 MPa,具有良好的綜合力學(xué)性能。

    Abstract:

    A new-type of low density TiAlBeSc alloy system was prepared by vacuum arc melting. The lowest density is 3.289 g/cm3. Its microstructures, thermal stability were studied using SEM (EDS), XRD, nanoindentation and DTA methods. The results show that the TiAlBeSc alloy system forms stable intermetallic compound and solid solution. No transformation occurs below 1000 °C. These alloys exhibit a very high thermal stability with a melting point above 1100 °C. For the equimolar TiAlBeSc alloy, 25% (atomic percentage) beryllium is totally dissolved in scandium lattice. The dendritic TiAl phase with L10 ordered structure is uniformly distributed in α-Sc matrix which exhibits excellent mechanical properties with hardness 7330 MPa.

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李 蘭,黃 粒,宋西平,葉 豐,林均品,陳國(guó)良.新型輕質(zhì)TiAlBeSc系合金的組織及性能[J].稀有金屬材料與工程,2012,41(5):826~829.[Li Lan, Huang Li, Song Xiping, Ye Feng, Lin Junpin, Chen Guoliang. Microstructure and Performance of TiAlBeSc Alloys with Low Density[J]. Rare Metal Materials and Engineering,2012,41(5):826~829.]
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  • 收稿日期:2011-05-15
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