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時(shí)效處理后鋁合金焊接接頭組織和性能的變化規(guī)律
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內(nèi)蒙古工業(yè)大學(xué)

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國(guó)家自然科學(xué)基金(51765053)、草原英才(DC1800007434) 、 內(nèi)蒙古自治區(qū)輕金屬材料與自然科學(xué)基金內(nèi)蒙古重點(diǎn)實(shí)驗(yàn)室(2017MS0502)


The change rule of microstructure and properties of aluminum alloy welded joints after aging treatment
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the Natural Science Foundation of China (51765053), the Grassland talents (dc1800007434), the Inner Mongolia Key Laboratory of light metal materials and Natural Science Foundation of Inner Mongolia Autonomous Region (2017MS0502).

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    摘要:

    本文主要是研究時(shí)效處理溫度和時(shí)效保溫時(shí)間對(duì)7075鋁合金激光焊接頭組織和性能的變化規(guī)律，使用掃描電鏡觀察焊接過(guò)程中形成的鏈條狀的T相隨著保溫時(shí)間的延長(zhǎng)，逐漸熔斷進(jìn)入基體，時(shí)效處理溫度120 ℃保溫24hT相呈均勻分布的球狀，減少了其對(duì)基體的割裂作用。通過(guò)TEM和SADE圖可以看出[011]Al、[12]Al、[001]Al晶帶軸均析出納米級(jí)強(qiáng)化相η"相，阻礙位錯(cuò)運(yùn)動(dòng)提高焊縫的力學(xué)性能，隨著時(shí)間的延長(zhǎng)η"相尺寸、分布密度發(fā)生變化，逐漸變成η相。通過(guò)對(duì)比顯微硬度和抗拉強(qiáng)度，時(shí)效處理溫度120 ℃保溫24h時(shí)7075鋁合金激光焊接頭的力學(xué)性能最好。

    Abstract:

    This paper mainly studied the change rule of aging treatment temperature and aging holding time on the structure and performance of 7075 aluminum alloy laser weld. Scanning Electron Microscopy (SEM) was used to observe the chain T phase formed during welding. With the extension of heat preservation time, the T phase melted into the substrate gradually. After aging treatment temperature 120 ℃ at 24 h,the T phasewas uniformly distributed in a spherical shape, which reduced its cleavage effect on the matrix. TEM and SADE image showed that the nanoscaleη" phase was precipitated on the crystal axis of [011]Al、[12]Al、[001]Al. With the extension of time, the size and distribution density of η" changed and gradually becameη. The phase prevented dislocation movement to improve the mechanical properties of welds. By comparing the microhardness and tensile strength, 7075 aluminum alloy laser welded joint has the best mechanical properties by aging treatment temperature 120 ℃ at 24 h.

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丁亞茹,陳芙蓉.時(shí)效處理后鋁合金焊接接頭組織和性能的變化規(guī)律[J].稀有金屬材料與工程,2021,50(11):4051~4058.[Ding Yaru, Chen Furong. The change rule of microstructure and properties of aluminum alloy welded joints after aging treatment[J]. Rare Metal Materials and Engineering,2021,50(11):4051~4058.]
DOI：10.12442/j. issn.1002-185X.20200889

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  • 收稿日期:2020-11-19
  • 最后修改日期:2021-02-02
  • 錄用日期:2021-02-04
  • 在線發(fā)布日期: 2021-11-30
  • 出版日期: 2021-11-24