Influence of Cooling Rate on Microstructural Formation of Melt-Spun Fe-Al-Nb Ternary Alloy

doi:10.11900/0412.1961.2016.00415

Acta Metall Sin

2017, Vol. 53

Issue (6): 641-647 DOI: 10.11900/0412.1961.2016.00415

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Influence of Cooling Rate on Microstructural Formation of Melt-Spun Fe-Al-Nb Ternary Alloy

Qianqian GU,Ying RUAN(

),Haizhe ZHU,Na YAN

Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, China

Cite this article:

Qianqian GU, Ying RUAN, Haizhe ZHU, Na YAN. Influence of Cooling Rate on Microstructural Formation of Melt-Spun Fe-Al-Nb Ternary Alloy. Acta Metall Sin, 2017, 53(6): 641-647.

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Abstract

Fe-Al-Nb ternary alloys as a sort of high-temperature structure materials are paid more attention in recent years. The pseudobinary eutectic composed of Nb(Fe, Al)₂ and α-Fe phases in Fe-Al-Nb alloy transformed from lamellar shape to fiber with the increase of growth rate in directional solidification. Heat treatment techniques were applied to investigate the strengthening mechanism related to microstructural formation. However, influence of cooling rate on microstructure especially pseudobinary eutectic is not clear yet. In this work, rapid solidification and the microstructural formation of Fe_67.5Al_22.8Nb_9.7 ternary alloy were investigated by melt spinning technique to reveal the rapid solidification mechanism of the alloy. As the wheel rate increases from 10 m/s to 40 m/s, the thickness of alloy ribbon decrease by one order of magnitude, i.e. from 67.70 μm to 4.69 μm, the cooling rate increases by seven times, i.e. from 1.24×10⁶ K/s to 9.53×10⁶ K/s. Consequently, the sample shape transforms from regular ribbon to regular ribbon, fishbone-like ribbon and droplets. The microstructure consists of Nb(Fe, Al)₂ and α-Fe phases. The rise of wheel rate leaded to the microstructural transition and refinement, as well as the refinement in terms of eutectic interlamellar spacing and grain size (i.e. grain diameter) measured using Image-Pro Plus software. On condition that the wheel rate is less than 40 m/s, the ribbon microstructural characteristics are divided into two regions, i.e. primary α-Fe phase plus lamellar pseudobinary eutectic near free surface region and anomalous pseudobinary eutectic near roller surface region. As the wheel rate increases from 10 m/s to 30 m/s, lamellar eutectic becomes fragmented and the amount of anomalous pseudobinary eutectic enlarges. Once the wheel rate is up to 40 m/s, anomalous pseudobinary eutectic is the only microstructure of the fishbone-like ribbon. Meanwhile, the alloy droplets with the diameter size ranging from 90 μm to 1500 μm were achieved at the wheel rate of 40 m/s. Owing to the relative low cooling rate, the microstructure of the alloy droplet consist of primary α-Fe phase and lamellar pseudobinary eutectic. As the droplet diameter decreases, the primary α-Fe phase transforms from dendrite to equiaxed grain and the pseudobinary lamellar eutectic is refined.

Key words: Fe-Al-Nb ternary alloy rapid solidification microstructure cooling rate eutectic

Received: 14 September 2016

Fund: Supported by National Natural Science Foundation of China (Nos.51327901, U1660108 and 51301138), Aviation Science Foundation of China (No.2014ZF53069), Shaanxi Industrial Science and Technology Project (No.2016GY-247) and NPU Foundation for Fundamental Research (No.3102015ZY077)

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	Qianqian GU
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	Haizhe ZHU
	Na YAN

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https://www.ams.org.cn/EN/10.11900/0412.1961.2016.00415 OR https://www.ams.org.cn/EN/Y2017/V53/I6/641

Fig.1 XRD spectrum of Fe_67.5Al_22.8Nb_9.7 ternary alloy

Fig.2 Ribbons thickness h versus wheel speed V_r

Fig.3 Temperature variations of Fe_67.5Al_22.8Nb_9.7 alloy at different V_r (a) and cooling curve of the alloy (b) (T_L—liquidus temperature, T_ΔH—temperature of releasing crystallization heat, R_c—cooling rate)

Fig.4 SEM images of Fe_67.5Al_22.8Nb_9.7 alloy ribbon at V_r=10 m/s (a, a1, a2), V_r=20 m/s (b, b1, b2), V_r=30 m/s (c) and V_r=40 m/s (d)

Table 1 Microstructural parameters of the alloy ribbons at different wheel speeds

Fig.5 Fishbone-like ribbons and droplets at V_r=40 m/s

Fig.6 Low (a, c) and locally high (b, d) magnified SEM images of Fe_67.5Al_22.8Nb_9.7 alloy droplets with droplet diameters D of 1045 μm (a, b) and 95 μm (c, d) at V_r=40 m/s

Fig.7 λ versus droplet diameter D of Fe_67.5Al_22.8Nb_9.7 alloy droplets

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