5FeSi相由塊狀轉(zhuǎn)變?yōu)榘雸A形態(tài)。共晶硅和金屬間化合物形態(tài)的演變和細(xì)化主要是由空化效應(yīng)引起的固體破碎、均勻的溶質(zhì)分布、均勻的溫度場(chǎng)及共晶生長(zhǎng)時(shí)間的縮短造成的。"/>

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超聲振動(dòng)對(duì)近共晶Al-Si活塞合金凝固組織的影響
作者:
作者單位:

1.西安工業(yè)大學(xué) 材料與化工學(xué)院，陜西 西安 710021;2.西安康博新材料科技有限公司，陜西 西安 710117

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基金項(xiàng)目:

Shaanxi Provincial scientific and technological research projects(S2018-YF-ZDLGY-0070) ， the Shaanxi creative talents promotion plan- technological innovation team (2017KCT-05)


Effect of Ultrasonic Vibration on Solidification Microstruc-ture in Near-Eutectic Al-Si Piston Alloy
Author:
Affiliation:

1.School of Materials Science and Chemical Engineering, Xi'an Technological University, Xi'an 710021, China;2.Xi'an Comboo New Materials Technology Co., Ltd, Xi 'an 710117, China

Fund Project:

Shaanxi Provincial Scientific and Technological Research Project (S2018-YF-ZDLGY-0070); Shaanxi Creative Talents Promotion Plan-Technological Innovation Team (2017KCT-05)

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    摘要:

    研究了超聲振動(dòng)對(duì)Al-11.5Si-4Cu-2Ni-1Mg-0.45Fe合金凝固組織的影響。結(jié)果表明，經(jīng)超聲振動(dòng)的合金中，初生硅形貌由長(zhǎng)條狀轉(zhuǎn)變?yōu)槎噙呅螤睿⒌玫搅孙@著細(xì)化。其中空化效應(yīng)產(chǎn)生的大過(guò)冷度引起的異質(zhì)形核和生長(zhǎng)時(shí)間縮短是初生硅細(xì)化的主要原因。隨著超聲功率的增加，初生硅由長(zhǎng)條狀轉(zhuǎn)變?yōu)槎贪魻睿?i>α-Al5FeSi相由塊狀轉(zhuǎn)變?yōu)榘雸A形態(tài)。共晶硅和金屬間化合物形態(tài)的演變和細(xì)化主要是由空化效應(yīng)引起的固體破碎、均勻的溶質(zhì)分布、均勻的溫度場(chǎng)及共晶生長(zhǎng)時(shí)間的縮短造成的。

    Abstract:

    The effect of ultrasonic vibration (USV) on solidification microstructure of Al-11.5Si-4Cu-2Ni-1Mg-0.45Fe (wt%) piston alloy was investigated. Results show that the significant refinement and morphology transformation from strip into compact polygon can be observed for the primary Si in the alloys produced by USV. The enhanced heterogeneous nucleation and shortened growth time caused by the large undercooling which is triggered by cavitation are responsible for the refinement of primary Si. The morphology of eutectic Si gradually develops from long plate into a short plate structure with increasing the ultrasonic power. Meanwhile, the morphology of α-Al5FeSi phases changes from coarsening block shape to half circle. The morphology evolution and refinement of eutectic Si as well as intermetallic particles are mainly due to the fragmentation of solid crystals, homogeneous solute distribution field and temperature field, and shortened eutectic growth time caused by cavitation.

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引用本文

董雄博,郭永春,李建平,夏峰,馬志軍,楊偉,王建利,胥濤,梁民憲.超聲振動(dòng)對(duì)近共晶Al-Si活塞合金凝固組織的影響[J].稀有金屬材料與工程,2022,51(1):11~17.[Dong Xiongbo, Guo Yongchun, Li Jianping, Xia Feng, Ma Zhijun, Yang Wei, Wang Jianli, Xu Tao, Liang Minxian. Effect of Ultrasonic Vibration on Solidification Microstruc-ture in Near-Eutectic Al-Si Piston Alloy[J]. Rare Metal Materials and Engineering,2022,51(1):11~17.]
DOI：10.12442/j. issn.1002-185X.20200901

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  • 收稿日期:2020-11-22
  • 最后修改日期:2021-04-08
  • 錄用日期:2021-04-15
  • 在線發(fā)布日期: 2022-02-04
  • 出版日期: 2022-01-28