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半固態(tài)擠壓鑄造A356合金在熱處理過(guò)程中的組織和性能演化
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作者單位:

1.東北大學(xué)材料科學(xué)與工程學(xué)院;2.中信戴卡集團(tuán)研究院;3.天津理工大學(xué)

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基金項(xiàng)目:

國(guó)家重點(diǎn)研發(fā)計(jì)劃（2018YFB2001800）、國(guó)家自然科學(xué)基金項(xiàng)目（U1764254）


Microstructure Evolution and Properties Improvement of Semi - solid Squeezed A356 Alloy during Heat Treatment
Author:
Affiliation:

1.Key Laboratory of Lightweight Structural Materials Liaoning Province,School of Materials Science and Engineering,Northeastern University;2.The CITIC Dicastal Institute

Fund Project:

National Key Research and Development Program of China (2018YFB2001800); National Natural Science Foundation of China (U1764254)

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    摘要:

    半固態(tài)擠壓鑄造的A356合金首先在540℃進(jìn)行固溶處理,隨著固溶溫度升高M(jìn)g和Si原子逐漸溶解于基體中,并產(chǎn)生了固溶強(qiáng)化作用?？估瓘?qiáng)度、延伸率和硬度在固溶6小時(shí)達(dá)到峰值,之后合金力學(xué)性能隨固溶時(shí)間延長(zhǎng)而下降。在固溶處理之后合金在180℃進(jìn)行了不同時(shí)間的時(shí)效處理。隨著時(shí)效時(shí)間延長(zhǎng),Mg2Si相逐漸在基體中析出,析出相顯著球化細(xì)化,尺寸約為2μm。經(jīng)過(guò)對(duì)合金組織和力學(xué)性能的分析,半固態(tài)擠壓鑄造A356合金的最佳熱處理制度為：540℃固溶6小時(shí),180℃時(shí)效4小時(shí)。經(jīng)過(guò)固溶和時(shí)效處理后的合金抗拉強(qiáng)度達(dá)到336MPa,延伸率達(dá)到6.9%,硬度達(dá)到HV124,相對(duì)于熱處理前提升了106.7%。

    Abstract:

    A356 alloy was processed by semi - solid squeeze casting followed by solution treatment at 540℃. With increasing solution time, Mg and Si elements dissolved into the matrix and led to solid solution strengthening. Tensile strength, elongation and hardness peaked at 6 h and then decreased during solution treatment. Aging treatment at 180℃ for different time was carried out after solution treatment. With increasing aging time, the fine spherical Mg2Si phases precipitated in the A356 alloy matrix, which were ca. 2 μm in size. The optimum heat treatment process was solid solution at 540℃ for 6 h followed by aging at 180℃ for 4 h. After solution and aging treatment, tensile strength and elongation reached 336 MPa and 6.9%, respectively. Hardness value reached 124 HV after heat treatment, which was 106.7% higher than the cast alloy.

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鐵鏑,顏路飛,管仁國(guó),季兆山,李洪超,王祥,劉海峰,劉德寶,陳民芳.半固態(tài)擠壓鑄造A356合金在熱處理過(guò)程中的組織和性能演化[J].稀有金屬材料與工程,2021,50(3):746~752.[Di Tie, Lufei Yan, Renguo Guan, Zhaoshan Ji, Hongchao Li, Xiang Wang, Haifeng Liu, Debao Liu, Minfang Chen. Microstructure Evolution and Properties Improvement of Semi - solid Squeezed A356 Alloy during Heat Treatment[J]. Rare Metal Materials and Engineering,2021,50(3):746~752.]
DOI：10.12442/j. issn.1002-185X.20200026

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  • 收稿日期:2020-01-12
  • 最后修改日期:2020-02-17
  • 錄用日期:2020-02-21
  • 在線發(fā)布日期: 2021-04-02
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