3Al和Nb2Al具有良好的強度和抗蠕變性能,NbAl3則是重要的高溫結(jié)構(gòu)材料,而目前公開文獻中關(guān)于Nb-Si基合金中含有Nb-Al金屬間化合物的報道較少。因此,本文重點關(guān)注高Al含量對合金中Nb-Al金屬間化合物形成的影響,研究兩個高Al含量的Nb-Ti-Si-Al合金(A2: Nb-18Ti-14Si-9Al、A4: Nb-21Ti-14Si-9Al)的微觀組織和力學性能,其中設(shè)計A4合金是為了分析Ti含量變化的影響。A2合金由(Nb)、Nb5Si3和Nb3Al三相組成,而A4合金由(Nb)和Nb5Si3兩相組成。A2和A4合金的室溫斷裂韌性分別為11.1 MPa.m1/2和10.9 MPa.m1/2,同時對兩個合金進行微壓痕測試,以表征合金在微觀尺度的力學性能。"/>

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Ti和Al的交互作用對Nb-Ti-Si-Al合金微觀組織和力學性能的影響
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長安大學材料科學與工程學院,西北工業(yè)大學 凝固技術(shù)國家重點實驗室,長安大學材料科學與工程學院

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國家自然科學基金項目（青年基金）


Study of Ti and Al interaction on microstructures and mechanical properties of the Nb-Ti-Si-Al alloys
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School of Materials Science and Engineering,Chang’an University,Xi’an,State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an,School of Materials Science and Engineering,Chang’an University,Xi’an

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    摘要:

    Nb-Si基超高溫合金由于具有低密度和高熔點,有望取代當前先進的Ni基高溫合金,成為新型的高溫結(jié)構(gòu)材料。Ti和Al均為對Nb-Si基合金有益的合金化元素。在文獻中,通常對低含量(≤ 3 at. % )Al進行合金化研究,在此情形下不會出現(xiàn)Nb-Al金屬間化合物相。Nb-Al金屬間化合物中Nb3Al和Nb2Al具有良好的強度和抗蠕變性能,NbAl3則是重要的高溫結(jié)構(gòu)材料,而目前公開文獻中關(guān)于Nb-Si基合金中含有Nb-Al金屬間化合物的報道較少。因此,本文重點關(guān)注高Al含量對合金中Nb-Al金屬間化合物形成的影響,研究兩個高Al含量的Nb-Ti-Si-Al合金(A2: Nb-18Ti-14Si-9Al、A4: Nb-21Ti-14Si-9Al)的微觀組織和力學性能,其中設(shè)計A4合金是為了分析Ti含量變化的影響。A2合金由(Nb)、Nb5Si3和Nb3Al三相組成,而A4合金由(Nb)和Nb5Si3兩相組成。A2和A4合金的室溫斷裂韌性分別為11.1 MPa.m1/2和10.9 MPa.m1/2,同時對兩個合金進行微壓痕測試,以表征合金在微觀尺度的力學性能。

    Abstract:

    Nb-Si based alloys show great promise to surpass current advanced Ni-base superalloys due to their low densities and high melting points. Both Ti and Al are beneficial alloying elements for Nb-Si based alloys. In the literature, small amount (≤ 3 at. % ) of Al have frequently examined, and Nb aluminides are usually not formed in this case. Since Nb3Al and Nb2Al have good strength and creep properties, NbAl3 is also a candidate hot-section material, and the study of Nb-Si alloys with these possible Nb alumininides is lacking, so we focus our efforts on primarily whether Nb aluminide is formed or not by adding more Al in the as-cast Nb-Ti-Si alloys. This work studied the microstructures and mechanical properties of two Nb-Ti-Si-Al alloys (A2: Nb-18Ti-14Si-9Al, A4: Nb-21Ti-14Si-9Al) with higher Al content, and the A4 alloy was designed to examine the alloying effect of more Ti. The A2 alloy consists of (Nb), Nb5Si3 and Nb3Al, while the A4 alloy is composed of (Nb) and Nb5Si3. The comparable fracture toughness of the A2 alloy and the A4 alloy is 11.1 MPa.m1/2 and 10.9 MPa.m1/2, respectively. Moreover, the indention experiments are employed to characterize the micro scale mechanical properties of these Nb-Ti-Si-Al alloys.

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孫志平,郭喜平,田曉東. Ti和Al的交互作用對Nb-Ti-Si-Al合金微觀組織和力學性能的影響[J].稀有金屬材料與工程,2016,45(7):1678~1682.[Sun Zhiping, Guo Xiping, Tian Xiaodong. Study of Ti and Al interaction on microstructures and mechanical properties of the Nb-Ti-Si-Al alloys[J]. Rare Metal Materials and Engineering,2016,45(7):1678~1682.]
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  • 收稿日期:2015-10-12
  • 最后修改日期:2015-12-24
  • 錄用日期:2016-03-23
  • 在線發(fā)布日期: 2016-10-09
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