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高能超聲與稀土釔復(fù)合作用對(duì)AZ91鑄態(tài)組織的影響
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國(guó)家自然科學(xué)基金(51165032)；江西省高等學(xué)校科技創(chuàng)新團(tuán)隊(duì)資助項(xiàng)目(00008713)和江西省研究生創(chuàng)新基金


Effect of Addition of Y with Ultrasonic Field Assistance on as-Cast Microstructure of AZ91 Alloy
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    摘要:

    以AZ91-Y為反應(yīng)體系，對(duì)熔體施加高能超聲，利用Miedema混合焓模型預(yù)測(cè)了合金析出相主要為Al-Y金屬間化合物，結(jié)合X射線衍射結(jié)果, 表明析出相為Al2Y。對(duì)材料顯微組織形貌分析，結(jié)果表明: 不施加超聲，稀土Y加入量超過(guò)1.0%(質(zhì)量分?jǐn)?shù))時(shí)，析出相Al2Y逐漸長(zhǎng)大并團(tuán)聚，晶粒細(xì)化效果不明顯；當(dāng)在850 ℃對(duì)AZ91-Y熔體超聲2 min后，Al2Y顆粒變細(xì)，分布均勻，材料組織中的β相Mg17Al12由連續(xù)狀變?yōu)閿嗬m(xù)狀或顆粒狀，晶粒變小，材料的顯微組織明顯細(xì)化

    Abstract:

    The effects of addition of Y with ultrasonic field assistance on as-cast microstructure of AZ91 alloy were studied. The predominant precipitated phases of AZ91-Y alloy system were worked out to be Al-Y intermetallics by Miedema’s model, and the new precipitated phases were verified to be Al2Y by the result of XRD. The phases and microstructure of the composites were also analyzed. The result shows that when the content of Y in AZ91 alloy exceeds 1.0%, the precipitated phases Al2Y grow up and agglomerate gradually, the grain refinement effect is not obvious. After the AZ91-Y melt are treated by ultrasonic for 2 min at 850 °C, Al2Y particles are refined and distribute uniformly, and the morphology of β-Mg17Al12 changes from continuous to discontinuous or spherical morphology, while the grain and microstructure of the alloy are refined obviously

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黃文先,閆 洪.高能超聲與稀土釔復(fù)合作用對(duì)AZ91鑄態(tài)組織的影響[J].稀有金屬材料與工程,2013,42(11):2346~2350.[Huang Wenxian, Yan Hong. Effect of Addition of Y with Ultrasonic Field Assistance on as-Cast Microstructure of AZ91 Alloy[J]. Rare Metal Materials and Engineering,2013,42(11):2346~2350.]
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  • 收稿日期:2012-11-05
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