EFFECT OF GROWTH ANGLE AND SOLIDIFICATION RATE ON THE FLOATING ZONE STABILITY FOR PROCESSING OF HIGH-TEMPERATURE PURE METALS

doi:10.11900/0412.1961.2014.00400

Acta Metall Sin

2015, Vol. 51

Issue (1): 114-120 DOI: 10.11900/0412.1961.2014.00400

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EFFECT OF GROWTH ANGLE AND SOLIDIFICATION RATE ON THE FLOATING ZONE STABILITY FOR PROCESSING OF HIGH-TEMPERATURE PURE METALS

LI Shuangming¹(

), GENG Zhenbo¹, HU Rui¹, LIU Yi², LUO Ximing²

1 State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072
2 Kunming Institute of Precious Metals, Kunming 650106

Cite this article:

LI Shuangming, GENG Zhenbo, HU Rui, LIU Yi, LUO Ximing. EFFECT OF GROWTH ANGLE AND SOLIDIFICATION RATE ON THE FLOATING ZONE STABILITY FOR PROCESSING OF HIGH-TEMPERATURE PURE METALS. Acta Metall Sin, 2015, 51(1): 114-120.

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Abstract

The height of floating zone and molten zone instability for five pure metals including Nb, W, Ta, Mo, and Ir with high melting points is investigated using electron beam floating zone method (EBFZM). The results show that the height level of floating zone for these five metals are in order with the sequence of Nb>Mo>W>Ta>Ir. The crystal growth angles for these metals are in the range of 8°~13° and the sample in large size can be developed by EBFZM as the growth angle is found not to be zero. Meanwhile, the actual growth angles are related with the interface growth mechanism. For continuous growth mechanism, the growth angles vary slightly with the solidification rate for rough interface, and for dislocation growth mechanism, the growth angles decrease with increasing the solidification rate. If faceting growth mechanism prevails, the growth angles drop remarkably at a low solidification rate and further increase with increasing the solidification rate. Additionally, by employing EBFZM growth of Ir and Mo pure metals, a solidification rate approaching 1 mm/min is available for controlling the growth angle and the height of floating zone. These calculations fit well with the experimental results of Mo single crystal prepared by EBFZM.

Key words: high-melting point metal electron beam floating zone method growth angle interface growth mechanism

ZTFLH:

TG292

Fund: Supported by National Natural Science Foundation of China-Yunnan Province Joint Fund (No.U1202273)

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	Shuangming LI
	Zhenbo GENG
	Rui HU
	Yi LIU
	Ximing LUO

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00400 OR https://www.ams.org.cn/EN/Y2015/V51/I1/114

Fig.1 Schematic shapes of a molten floating zone growth of a cylindrical crystal by electron beam floating zone method (EBFZM) (M—melting interface, S—solidification interface, L—liquid metal, a—growth angle, r_c—growing crystal radius, h—height of molten zone, R₁ and R₂—radii of principal curvature, r—axial coordinate, z—vertical coordinate)

(a) upward growth

(b) pulling down growth

Table 1 Physical parameters for five pure metals with high melting points^[13,14]

Fig.2 Relationship of heights of floating zone of Ir, Mo, Nb, Ta, and W with the radius of the floating zone stable growth by EBFZM, and imposed with the Rayleigh′s instability results

Fig.3 Relationship of heights of floating zone of Ir and Mo with the radius of floating zone stable growth by EBFZM as the growth angle does not equal to zero

Fig.4 Crystal growth angles as a function of the solidification rate for Ir (a) and Mo (b) prepared by EBFZM

Fig.5 Heights of floating zone vs the solidification rate of Ir (a) and Mo (b) in diameter of 30 mm prepared by EBFZM at different growth mechanisms

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