Effect of Low Voltage Pulsed Magnetic Field on Microstructure and Damping Capacity of A357 Alloy

Long Chao; Luo Kun; Zhang Lei; Yao Junping; Huang Meifang

doi:10.15980/j.tzzz.2014.07.026

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Effect of Low Voltage Pulsed Magnetic Field on Microstructure and Damping Capacity of A357 Alloy
Vol. 34, Issue 7, Pages: 761-763(2014)
Published： 2014 ，
DOI： 10.15980/j.tzzz.2014.07.026

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[1]龙超,罗琨,张磊,尧军平,黄梅芳.低压脉冲磁场对A357合金组织及阻尼性能的影响[J].特种铸造及有色合金,2014,34(07):761-763.

Long Chao, Luo Kun, Zhang Lei, et al. Effect of Low Voltage Pulsed Magnetic Field on Microstructure and Damping Capacity of A357 Alloy. [J]. Special Casting & Nonferrous Alloys 34(7):761-763(2014)
[1]龙超,罗琨,张磊,尧军平,黄梅芳.低压脉冲磁场对A357合金组织及阻尼性能的影响[J].特种铸造及有色合金,2014,34(07):761-763. DOI： 10.15980/j.tzzz.2014.07.026.

Long Chao, Luo Kun, Zhang Lei, et al. Effect of Low Voltage Pulsed Magnetic Field on Microstructure and Damping Capacity of A357 Alloy. [J]. Special Casting & Nonferrous Alloys 34(7):761-763(2014) DOI： 10.15980/j.tzzz.2014.07.026.

摘要

研究了低压脉冲磁场对A357合金凝固组织及阻尼性能的影响。结果表明

低压脉冲磁场对A357合金凝固组织中初生α-Al相和共晶Si相具有显著的细化和变质作用。施加磁场处理后

T6态A357合金的阻尼性能显著提高。当在室温、频率为1 Hz和应变振幅为0.01%的条件下

经磁场处理的T6态A357合金的阻尼值达到了0.014 2

较未施加磁场处理的A357合金提高了170%。随着频率的增加

经磁场处理的T6态A357合金的阻尼值逐渐降低。

Abstract

Effects of low voltage pulsed magnetic field（ LVPMF） on the solidified microstructure and damping capacity of A357 alloy were investigated. Experimental results show that primary α-Al phase and eutectic Si phase in A357 alloy treated by LVPMF are refined significantly. A357 alloy treated by LVPMF exhibits much higher damping Capacity than that untreated by LVPMF. Moreover

damping capacity is increased with increasing in temperature

whereas decreased with increasing in frequency. At room temperature

strain amplitude of 0. 01%and frequency of 1 Hz

the damping capacity value reaches 0. 0142 for A357 alloy with LVPMF treatment. Compared with the A357 alloy without LVPMF treatment

the damping capacity value is increased by approximately170%. With increasing in frequency

damping capacity of T6-treated A357 alloy after LVPMF treatment is decreased gradually.