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金属学报    DOI: 10.11900/0412.1961.2016.00504
  论文 本期目录 | 过刊浏览 |
Cu的析出及其对FeCrMoCu合金阻尼性能和力学性能的影响
  胡小锋1  杜瑜宾1,2  闫德胜1  戎利建1
 1 中国科学院核用材料与安全评价重点实验室(中国科学院金属研究所),沈阳 110016
2 中国科学技术大学材料科学与工程学院,沈阳 110016
CU PRECIPITATION AND ITS EFFECT ON DAMPING CAPACITY AND MECHANICAL PROPERTIES OF FECRMOCU ALLOY
全文: PDF(811 KB)  
摘要: 采用扫描透射电镜(STEM)和动态机械分析仪(DMA)研究了FeCrMoCu合金(Cu添加量为1.0%和2.0%)在不同冷速条件下Cu的析出行为及其对阻尼性能和力学性能的影响。结果表明:在1.0Cu合金中Cu主要以过饱和的形式固溶在基体,当冷速较慢时会析出少量的富铜bcc-Cu相,该相尺寸较小(< 5 nm),与基体共格;Cu增加到2.0%后,随着冷速的降低,先析出数量较少、尺寸较小的富铜bcc-Cu相,随后析出相长大呈球状(10~15 nm)且数量增多,最后粗化成圆棒状(100~400 nm)但数量显著减少,后两种析出相均为非共格的ε-Cu相。含Cu第二相的析出,明显增加合金平均内应力,使合金的阻尼性能显著下降,因此有第二相析出的2.0Cu合金的阻尼性能明显低于1.0Cu合金。与此同时,合金的强度随着Cu相的析出而明显提高,其中富铜bcc-Cu相的析出强化效果较好,且对塑韧性的影响相对较小。含1.0%Cu的FeCrMoCu合金可以同时获得较好的阻尼性能和力学性能。
关键词 FeCrMoCu合金Cu冷却速度析出相阻尼性能    
Abstract:Fe-Cr based damping alloys have high mechanical properties and good corrosion resistance, which have been applied to reduce vibration and noise. Their high damping behavior is primarily attributed to the stress-induced irreversible movement of 90? magnetic domain walls. Recently, a FeCrMo damping alloy with addition of Cu was found to possess higher damping and high mechanical properties. In the present paper, scanning transmission electron microscopy (STEM) and dynamic mechanical analyzer (DMA) were used to investigate the Cu precipitation and its influences on damping capacity and mechanical properties of FeCrMoCu alloy (1.0% and 2.0% Cu addition) with different cooling rates. The results show that the Cu element in 1.0Cu alloy is fully solid solution in the matrix. When the cooling rate is slow, there will precipitate a small amount of second phases, which are Cu-riched, small in size of < 5 nm and coherent with the matrix. As for 2.0Cu alloy, with decreasing cooling rate there will firstly precipitate a small amount of bcc-Cu with small size. Subsequently, the particles grow into a spherical shape (10~15 nm) and their number increases. At last, the particles transform into round bar with coarse size of 100~400 nm and the precipitate number decreases obviously. The latter two kinds of particles are non-coherent ε-Cu phases. These precipitates will significantly increase the average internal stress of the experimental FeCrMoCu alloy, which will obviously decrease the damping capacity. Therefore, the damping capacity of 2.0Cu alloy is significantly lower than 1.0Cu alloy. Meanwhile, the precipitate will obviously improve strength. Compared with ε-Cu phase, the bcc-Cu phase has better hardening effect and its influence on ductility and toughness is relatively small. The FeCrMoCu alloy with addition of 1.0% Cu can obtain better damping capacity and mechanical properties at the same time.
Key wordsFeCrMoCu alloy    Cu    cooling rate    precipitate    damping capacity
收稿日期: 2016-11-11      出版日期: 2017-02-27
ZTFLH:  TG142.71  
基金资助:磁畴结构对铁磁合金阻尼性能的影响机制
通讯作者: 胡小锋   
Corresponding author: Xiao-Feng HU   

引用本文:

胡小锋 杜瑜宾 闫德胜 戎利建. Cu的析出及其对FeCrMoCu合金阻尼性能和力学性能的影响[J]. 金属学报, 10.11900/0412.1961.2016.00504.

链接本文:

http://www.ams.org.cn/CN/Y0/V/I/0

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