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鑄態(tài)Ti-22Al-25Nb合金的結(jié)構(gòu)特征與力學(xué)性能
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南京理工大學(xué)

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中圖分類(lèi)號(hào):

TG294

基金項(xiàng)目:

國(guó)家自然科學(xué)基金項(xiàng)目（面上項(xiàng)目，重點(diǎn)項(xiàng)目，重大項(xiàng)目）


Structural features and mechanical properties of as-cast Ti-22Al-25Nb alloy
Author:
Affiliation:

School of Mechanical Engineering,Nanjing University of Science and Technology

Fund Project:

The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    Ti2AlNb基合金是目前有望在650-800℃溫度范圍內(nèi)取代高溫鎳基合金的金屬間化合物。利用水冷銅坩堝感應(yīng)懸浮熔煉法，通過(guò)調(diào)控熔煉工藝，制備了主相分別為B2/?相和O相 Ti-22Al-25Nb合金鑄錠，通過(guò)XRD、SEM等手段進(jìn)行了合金結(jié)構(gòu)特征的表征，通過(guò)室溫拉伸試驗(yàn)、室溫壓縮試驗(yàn)、納米壓痕試驗(yàn)測(cè)試了合金的力學(xué)性能并分析了斷口形貌。研究表明，鑄態(tài)Ti-22Al-25Nb合金晶粒尺寸達(dá)到數(shù)百微米。相組成對(duì)鑄態(tài)Ti-22Al-25Nb合金的力學(xué)性能有一定影響，鑄態(tài)O相合金的極限抗拉強(qiáng)度達(dá)到了1125MPa，超過(guò)了鑄態(tài)B2/?相合金的1031MPa，但粗大晶粒導(dǎo)致合金塑性較差（鑄態(tài)B2/?相與鑄態(tài)O相合金的延伸率分布為1.82%與1.32%）。鑄態(tài)Ti-22Al-25Nb合金的拉伸斷口與壓縮斷口均具有明顯的解理斷裂特征，拉伸斷口主要表現(xiàn)為沿晶斷裂，壓縮斷口主要表現(xiàn)為穿晶斷裂。

    Abstract:

    Ti2AlNb-based alloy is a kind of intermetallic compound. It is expected to replace Ni-based superalloys for high-temperature structural applications with a temperature range of 650-800 ℃. In this work, a Ti2AlNb based alloy with a nominal composition of Ti-22Al-25Nb is prepared by water-cooled copper crucible induction floating melting method. The structural features of the as-cast Ti-22Al-25Nb alloy are characterized by XRD and SEM. It is found that the main phase of the as-cast Ti-22Al-25Nb alloy can be B2/? phase or O phase, depending on its melting and casting process parameters. The grain size of the as-cast Ti-22Al-25Nb alloy reaches several hundred microns. The mechanical properties of the as-cast Ti-22Al-25Nb alloy are investigated by tensile, compressive and nanoindentation tests at room temperature. The ultimate tensile strength of the as-cast Ti-22Al-25Nb O phase alloy and B2/? alloy reaches 1125 MPa and 1031 MPa respectively, with the elongation of 1.32% and 1.82%. The nanoindentation hardness of the as-cast Ti-22Al-25Nb O phase alloy is slightly higher than that of the as-cast B2/? phase alloy. The tensile fracture and compression fracture of as-cast Ti-22Al-25Nb alloy show obvious cleavage fracture characteristics. In addition, the tensile fracture is mainly intergranular, while the compression fracture is mainly transgranular.

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引用本文

楊龍川,蘇艷,杜宇雷,廖文和.鑄態(tài)Ti-22Al-25Nb合金的結(jié)構(gòu)特征與力學(xué)性能[J].稀有金屬材料與工程,2020,49(11):3902~3908.[Yang Longchuan, Su Yan, Du Yulei, Liao Wenhe. Structural features and mechanical properties of as-cast Ti-22Al-25Nb alloy[J]. Rare Metal Materials and Engineering,2020,49(11):3902~3908.]
DOI：10.12442/j. issn.1002-185X.20190991

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  • 收稿日期:2019-11-26
  • 最后修改日期:2019-12-17
  • 錄用日期:2020-01-03
  • 在線發(fā)布日期: 2020-12-09
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