LD7铝合金淬火敏感性及相变动力学规律<sup>*</sup>

doi:10.11896/j.issn.1005-023X.2017.012.029

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Abstract The quench sensitivity of LD7 aluminum alloy was determined by the time-temperature-transformation (TTT) curves and time-temperature-property (TTP) curves by an interrupted quench technique with measurement of as-quenched electro-conductivity and as-aged hardness.The microstructure evolution and phase transformation kinetics during isothermal quenching treatment were studied by the transmission electron microscopy (TEM) and Johnson-Mehl-Avrami (JMA) equation. The results showed that the nose temperature of TTT curves and TTP curves were both about 350 ℃, and the incubation period was about 2 s, with the quench sensitivity range of 290-410 ℃. The supersaturated solid solution decomposed and particles precipitate during quench process; the precipitation rate was the highest at the nose temperature. Prolonging holding time leads to bigger and coarser second phase particles and widened precipitation free zone in the matrix, more spaced second phase particles precipitated at the grain boundary, which resulted in the loss of solutes and decrease of subsequent aging hardening effect. The fitted S-curve according to the phase transformation kinetics equation explained that the precipitation rate was the highest at about 350 ℃ and the mechanism of solid solution mainly precipitates as needle-like phases during quench sensitive range.

Key words： LD7 aluminum alloy time-temperature-transformation (TTT) curves time-temperature-property (TTP) curves quench sensitivity phase transformation kinetics

Published: 08 May 2018

CLC number:

TG146.21

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	Articles by authors
	JIANG Dao
	YI Youping
	HUANG Shiquan

Cite this article:

JIANG Dao,YI Youping,HUANG Shiquan. Quench Sensitivity and Phase Transformation Kinetics of LD7 Aluminum Alloy[J]. Materials Reports, 2017, 31(12): 140-144.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.012.029 OR http://www.mater-rep.com/EN/Y2017/V31/I12/140

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