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7050合金固溶后在180℃~250℃等溫淬火時(shí)的析出行為
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東北大學(xué)材料科學(xué)與工程學(xué)院 材料各向異性與織構(gòu)教育部重點(diǎn)實(shí)驗(yàn)室

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中圖分類號(hào):

TG146.21

基金項(xiàng)目:

十三五國家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2016YFB0300801)；國家自然科學(xué)基金青年科學(xué)基金項(xiàng)目(51371045)


Precipitation behavior of 7050 alloy during isothermal quenching in 180℃~250℃ after solid-solution treatment
Author:
Affiliation:

Key Laboratory for Anisotropy and Texture of Materials,Ministry of Education,School of Materials Science and Engineering,Northeastern University

Fund Project:

National Key Research and Development Program of China (Grant No. 2016YFB0300801); National Natural Science Foundation of China (Grant No. 51371045)

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    摘要:

    本文研究了7050合金固溶后在180℃~250℃等溫淬火過程中，合金的電導(dǎo)率、硬度與微觀組織之間的關(guān)系。結(jié)果表明，7050合金在180℃和200℃等溫淬火初期，等溫樣品的淬火態(tài)電導(dǎo)率低于固溶后直接水淬樣品；隨著等溫時(shí)間延長，等溫樣品自然時(shí)效態(tài)硬度先升后降。7050合金在180℃等溫128 min時(shí)，基體內(nèi)形成GPΙ區(qū)和η’相；在200℃等溫32 min時(shí)，基體內(nèi)形成GPΙ區(qū)和部分GPΙΙ區(qū)；在250℃等溫32 min時(shí)，基體內(nèi)形成η’相和S相。合金基體內(nèi)形成強(qiáng)化相是造成等溫淬火初期合金自然時(shí)效態(tài)硬度上升的主要原因。7050合金固溶后在200℃等溫淬火16 min，此時(shí)合金T6狀態(tài)的硬度較固溶后直接水淬樣品僅下降3.4%，而電導(dǎo)率上升達(dá)9.2%，性能接近回歸制度為180℃-32min的RRA工藝處理后合金的性能，若將該等溫淬火制度作為7050合金板材固溶后水淬前的預(yù)處理工藝，可使板材獲得較好的綜合性能。

    Abstract:

    In present work, the relationships between electrical conductivity, hardness and microstructures of 7050 alloy during isothermal quenching in 180℃~250℃ following solid-solution treatment were investigated. Results show that in the initial stage of isothermal quenching at 180℃ and 200℃, electrical conductivity of isothermal specimens is lower than that of the specimen direct water quenching following solid-solution treatment and with the increase of isothermal time, hardness of isothermal specimens in natural aging temper increases at first and then decreases. With isothermal quenching at 180℃ for 128 min GPΙ zones and η’ phases are formed in matrix, with isothermal quenching at 200℃ for 32 min GPΙ and GPΙΙ zones are formed in matrix, and with isothermal quenching at 250℃ for 32 min η’ and S phases are formed in matrix. The formation of strengthening phases during isothermal quenching is the main reason for the hardness of specimens increase in natural aging temper. When 7050 alloy plates are isothermal quenching at 200℃ for 16 min following solid-solution treatment, their T6 temper hardness is only 3.4% lower than that of the direct water quenching plates and their conductivity increases by 9.2%, which are close to the properties of RRA treated plates with the regression regime of 180℃ for 32 min. Therefore, taking isothermal quenching at 200℃ for 16 min as a pre-treatment process following solid-solution treatment it will make 7050 alloy plates obtain excellent comprehensive properties.

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引用本文

康雷,趙剛,田妮.7050合金固溶后在180℃~250℃等溫淬火時(shí)的析出行為[J].稀有金屬材料與工程,2019,48(2):482~490.[Kang Lei, Zhao Gang, Tian Ni. Precipitation behavior of 7050 alloy during isothermal quenching in 180℃~250℃ after solid-solution treatment[J]. Rare Metal Materials and Engineering,2019,48(2):482~490.]
DOI：10.12442/j. issn.1002-185X.20170570

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  • 收稿日期:2017-06-28
  • 最后修改日期:2018-01-03
  • 錄用日期:2018-01-04
  • 在線發(fā)布日期: 2019-03-15
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