RESERCH ON QUENCH SENSITIVITY AND MICROSTRUCTURE ANALYSIS OF 7050 ALUMINUM ALLOY

doi:10.11900/0412.1961.2016.00050

Acta Metall Sin

2016, Vol. 52

Issue (12): 1503-1509 DOI: 10.11900/0412.1961.2016.00050

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RESERCH ON QUENCH SENSITIVITY AND MICROSTRUCTURE ANALYSIS OF 7050 ALUMINUM ALLOY

Shuzhou WU¹,Youping YI¹,Shiquan HUANG¹(

),Jun LI¹,Chen LI²

1 State Key Laboratory of High Performance Complex Manufacturing, School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
2 The First Aircraft Institute of AVIC, Xi'an 710089, China

Cite this article:

Shuzhou WU,Youping YI,Shiquan HUANG,Jun LI,Chen LI. RESERCH ON QUENCH SENSITIVITY AND MICROSTRUCTURE ANALYSIS OF 7050 ALUMINUM ALLOY. Acta Metall Sin, 2016, 52(12): 1503-1509.

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Abstract

7050 aluminum alloy is an important structural material widely used in aerospace industry with a high quench sensitivity. In this work, the time-temperature-transformation (TTT) curves of 7050 aluminum alloy were determined by interrupted quench method. The microstructure evolution and phase transformation kinetics during solid solution, isothermal quenching, ageing treatment were studied by TEM and JMA equation．The results show that the nose temperature of TTT curves is about 330 ℃, with the quench sensitivity range of 300~380 ℃. The quenching sensitivity of high temperature range of 400~450 ℃ is lower than that of low temperature range of 210~270 ℃. The laminar equilibrium η phases characterized with nucleus of Al₃Zr particles and several needle-shaped S phases are the main precipitations of the supersaturated solid solution decomposes during isothermal holding process. With the increase of holding time, the volume fraction of precipitated phases rises quickly, which coarsen the grain boundary continuously and broaden precipitation free zone (PFZ). While holding far away from the nose temperature, the speed of precipitation slow down and the degree of continuity and coarsening of grain boundary decrease. The values of n in JMA equation vary from 0.50 to 0.65, indicating that the precipitations are mainly laminar precipitated phases and supplementarily needle-shaped phases.

Key words: 7050 aluminum alloy, TTT curve, quench sensitivity, phase transformation kinetics, microstructure

Received: 01 February 2016

Fund: Supported by National Basic Research Program of China (No.2012CB619504), International Science and Technology Cooperation Program of China (No.2014DFA51250) and Open Research Fund of State Key Laboratory of High Performance Complex Manufacturing (No.zzyjkt2014-02)

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	Shuzhou WU
	Youping YI
	Shiquan HUANG
	Jun LI
	Chen LI

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https://www.ams.org.cn/EN/10.11900/0412.1961.2016.00050 OR https://www.ams.org.cn/EN/Y2016/V52/I12/1503

Fig.1 Microstructure of 7050 aluminum alloy mold piece

Fig.2 Influence of holding time (t) on electric conductivity of water-quenched alloy at temperatures of 210~330 ℃ (a) and 360~450 ℃ (b)

Fig.3 Time-temperature-transformation (TTT) curves of 7050 aluminum alloy during isothermal holding process

Table 1 Coefficients of S curves for 7050 aluminum alloy by fitting

Fig.4 S curves of 7050 aluminum alloy at isothermal holding process

Fig.5 TEM images of quenched alloy after holding at 330 ℃ for 0 s (a, d), 10 s (b, e) and 300 s (c, f) (η—MgZn₂, S—Al₂CuMg, T—AlZnMgCu)

Fig.6 TEM images of two-stage aged alloy after holding 300 s at temperatures of 330 ℃ (a, c) and 380 ℃ (b, d) (PFZ—precipitation free zone)

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