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Al-Er-Zr合金的熱變形行為及動(dòng)態(tài)析出
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北京市朝陽(yáng)區(qū)平樂園100號(hào)北京工業(yè)大學(xué)材料科學(xué)與工程學(xué)院

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Hot deformation behavior and dynamic precipitation in Al-Er-Zr alloy
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    摘要:

    通過(guò)對(duì)Al-0.04Er-0.08Zr合金進(jìn)行200°C 到450°C 范圍內(nèi)的熱壓縮測(cè)試對(duì)該合金的熱變形行為進(jìn)行了研究，在這個(gè)過(guò)程中利用Arrhenius-type方程進(jìn)行線性擬合從而分析應(yīng)力-應(yīng)變曲線，之后通過(guò)透射電鏡來(lái)觀察研究變形組織。結(jié)果表明對(duì)于固溶態(tài)以及時(shí)效態(tài)合金來(lái)講，在熱壓縮過(guò)程中動(dòng)態(tài)回復(fù)是使合金軟化的一個(gè)主要機(jī)制。高溫以及低應(yīng)變速率的熱變形會(huì)誘導(dǎo)固溶態(tài)合金快速析出。動(dòng)態(tài)析出會(huì)明顯增加固溶態(tài)合金在熱壓縮過(guò)程中其表面的流變應(yīng)力，但是卻不能有效提高變形合金的硬度。動(dòng)態(tài)析出還會(huì)導(dǎo)致應(yīng)力-應(yīng)變曲線擬合出現(xiàn)Arrhenius型偏差。

    Abstract:

    The hot deformation behavior of Al-0.04Er-0.08Zr alloy was investigated by hot compression tests in the temperature range from 200°C to 450°C. True stress-true strain curves were analyzed by linear fitting using Arrhenius-type equation, and deformation microstructure was studied by TEM. The results indicate that dynamic recovery is the dominated softening mechanism for both the solutionized and the aged sample during hot compression. Hot deformation especially at high temperature and low strain rate induced rapid precipitation in the solutionized samples. Dynamic precipitation apparently led to the increase of the flow stress of the solutionized samples during hot compression process, but did not effectively enhance the microhardness of the deformed samples. The dynamic precipitation also led to deviations of the Arrhenius-type fitting of the stress-strain curves.

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袁曉明,文勝平. Al-Er-Zr合金的熱變形行為及動(dòng)態(tài)析出[J].稀有金屬材料與工程,2020,49(7):2305~2313.[yuanxiaoming, wenshengping. Hot deformation behavior and dynamic precipitation in Al-Er-Zr alloy[J]. Rare Metal Materials and Engineering,2020,49(7):2305~2313.]
DOI：10.12442/j. issn.1002-185X.20190359

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  • 收稿日期:2019-04-25
  • 最后修改日期:2019-05-31
  • 錄用日期:2019-06-05
  • 在線發(fā)布日期: 2020-08-31
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