EFFECT OF Hf, Sn, Ta, Zr, Dy AND Ho ON MICRO- STRUCTURE AND MECHANICAL PROPERTIES OF Nb-Nb5Si3 ALLOY

doi:10.11900/0412.1961.2014.00477

Acta Metall Sin

2015, Vol. 51

Issue (7): 815-827 DOI: 10.11900/0412.1961.2014.00477

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EFFECT OF Hf, Sn, Ta, Zr, Dy AND Ho ON MICRO- STRUCTURE AND MECHANICAL PROPERTIES OF Nb-Nb₅Si₃ ALLOY

Jianting GUO(

),Lanzhang ZHOU,Yuxin TIAN,Jieshan HOU,Gusong LI

Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

Cite this article:

Jianting GUO,Lanzhang ZHOU,Yuxin TIAN,Jieshan HOU,Gusong LI. EFFECT OF Hf, Sn, Ta, Zr, Dy AND Ho ON MICRO- STRUCTURE AND MECHANICAL PROPERTIES OF Nb-Nb₅Si₃ ALLOY. Acta Metall Sin, 2015, 51(7): 815-827.

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Abstract

This paper reviews the research works of effects of elements on the microstructure and mechanical properties of Nb-Si alloys conducted by the authors in recent years, including effect of Hf on Ni-16Si, Hf and Sn on Ni-20Ti-5Cr-3Al-18Si, Zr on Ni-22Ti-16Si, Ta on Nb-22Ti-16Si-7Cr-3Al, and rare earth elements Dy and Ho on Ni-23Ti-10Ta-2Cr-18Si and Ni-22Ti-16Si-7Cr-3Al-3Ta-2Hf, respectively. The addition of elements Hf, Zr, Sn+Hf, Ta, Dy and Ho in Nb-Si binary system and multi-component system enhances room and high temperature strength, plasticity and fracture toughness obviously. The enhancement of strength is related with the solution strengthening of elements, and the improvement of plasticity and ductility is related with the fining of microstructure and the increase of particles which exceed the critical size of (Nb, Ti)ss.

Key words: Nb₅Si₃ alloy element microstructure mechanical property

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	Jianting GUO
	Lanzhang ZHOU
	Yuxin TIAN
	Jieshan HOU
	Gusong LI

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00477 OR https://www.ams.org.cn/EN/Y2015/V51/I7/815

Fig.1 BSE images of Nb-16Si alloy with different contents of Hf^[10]

(a) Nb-16Si (b) Nb-16Si-1Hf (c) Nb-16Si-3Hf (d) Nb-16Si-7Hf

Table 1 Chemical compositions of phases in Nb-16Si alloy with different contents of Hf ^[10]

Fig.2 Effect of Hf contents on room temperature toughness of Nb-16Si alloy^[10]

Fig.3 Morphologies of crack propagation through bridging (a) and deflection (b) of Nb-16Si-1Hf alloy ^[10]

Fig.4 BSE images of Nb-20Ti-3Cr-3Al-18Si (alloy A) (a), Nb-20Ti-3Cr-3Al-18Si-1.5Sn (alloy B) (b) and Nb-20Ti-3Cr-3Al-18Si-1.5Sn-4Hf (alloy C) (c)^[1]

Fig.5 Morphology of Hf-rich white phase (a) and selected area diffraction pattern from the white phase along zone axis [112ˉ3] of g-(Nb, Ti)₅Si₃ (b)^[1]

Table 2 Chemical compositions of phases in alloys A, B and C^[1]

Table 3 Summary of Vickers hardness, yield strength, fracture stress and compressive ducility of alloys A, B and C^[1]

Fig.6 BSE images of as-cast Nb-22Ti-16Si-7Cr-3Al alloy with Ta contents of 0 (a), 2% (b), 5% (c) and 10% (d)^[13]

Table 4 Chemical compositions of phases in Nb-22Ti-16Si-7Cr-3Al alloy with different Ta contents^[13] (atomic fraction /%)

Fig.7 Compressive yield strength and fracture strain for Nb-22Ti-16Si-7Cr-3Al alloy with different Ta contents at room temperature^[13]

Fig.8 Compressive yield strength for Nb-22Ti-16Si-7Cr-3Al alloy with different Ta contents at 1000 ℃^[13]

Fig.9 BSE images of Nb-22Ti-16Si alloy with Zr contents of 0 (a), 2% (b) and 4% (c)^[11]

Table 5 Chemical compositions of phases in Nb-22Ti-16Si alloys with different Zr contents^[12]

Fig.10 TEM bright- field image of g- Nb₅Si₃ in Nb- 22Ti- 16Si alloy with 3%Zr (a) and selected area diffraction pattern along zone axis [112ˉ3] of g-(Nb, Ti)₅Si₃ (b) [11]

Fig.11 HRTEM image of (Nb, Ti)ss/g-(Nb, Ti)₅Si₃ interface^[20]

Fig.12 Compressive properties of Nb-22Ti-16Si alloys with different Zr contents^[11]

Table 6 Vickers hardness (HV) of constituent phases of Nb-22Ti-16Si alloy with different Zr contents^[11]

Fig.13 Fracture morphologies of Nb-22Ti-16Si alloy with Zr contents of 0 (a), 2% (b) and 4% (c) after room temperature compression^[12]

Fig.14 BSE images of Nb-23Ti-10Ta-2Cr-18Si-xDy alloy with x=0 (a) and x=0.1 (b)^[13]

Table 7 Chemical compositions of phases in Nb-23Ti-10Ta-2Cr-18Si-xDy (x=0, 0.1) alloys^[13]

Fig.15 BSE image of Nb-22Ti-16Si-7Cr-3Al-3Ta-2Hf-0.1Ho alloy^[17]

Fig.16 Bright-field TEM image of a-(Nb, Ti)₅Si₃/(Nb, Ti)ss (Inset shows the corresponding SAED pattern, zone axis is [310]_a//[110]_Nb)^[20]

Fig.17 EDS line-scanning curves across the interface between (Nb, Ti)ss and (Nb, Ti)₅Si₃ phases in the alloy with 0.1%Dy^[13]

Table 8 Compressive properties of Nb-23Ti-10Ta-2Cr-18Si-xDy (x=0, 0.1) alloys^[14]

Fig.18 Mechanical properties of Nb-22Ti-16Si-7Cr-3Al-3Ta-2Hf alloy with different Ho contents^[15]

Fig.19 BSE images of Nb-22Ti-16Si-7Cr-3Al-3Ta-2Hf-0.1Ho alloy in transverse (a) and longitudinal (b) sections^[19]

Fig.20 Compressive true stress-strain curves of conventional cast (CC) and directionally solidified (DS) alloys at 1623 K^[19]

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