Effect of Aging Treatment on Precipitation Behavior and Mechanical Properties of a Novel Aluminum-Lithium Alloy

doi:10.1007/s40195-015-0244-6

Abstract

Abstract:

In this work, the microstructure and precipitation phases were primarily characterized by transmission electron microscopy. The mechanical properties were evaluated by tensile and tear test. The results indicated that the samples aged at 145 °C for 45 h or 155 °C for 30 h possessed a preferable combination of strength and plasticity, owing to the precipitation of well-dispersed T₁ (Al₂CuLi) phases (diameter < 150 nm). However, aging at more than 165 °C caused an obvious size growth of T₁ plates, leading to the quick reduction in plasticity and toughness. Furthermore, the high Cu/Li ratio resulted in distinct precipitation features, including a shorter incubation time of T₁ phase and the aggravated precipitate-free zones.

Key words: Aluminum-lithium, alloy, Aging, treatment, Fracture, toughness, Microstructure

Hua-Guan Li, Juan Ling, Yi-Wei Xu, Zhong-Gang Sun, Hong-Bing Liu, Xing-Wei Zheng, Jie Tao. Effect of Aging Treatment on Precipitation Behavior and Mechanical Properties of a Novel Aluminum-Lithium Alloy[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(6): 671-677.

Figures/Tables 9

Table 1 Chemical composition of the novel aluminum-lithium alloy (wt%)

Li	Cu	Mg	Ag	Zr	Mn	Zn	Al
0.7	3.7	0.7	0.34	0.11	0.29	0.32	Bal.

Fig. 1 The tear test of the novel aluminum-lithium alloy: a the specimen geometries (in mm); b the objective graph

Fig. 2 The effect of the aging time on the tensile properties: a the tensile strength; b the yield strength; c the elongation

Fig. 3 Tear-test curve and the fracture morphology

Table 2 Calculated toughness of the aged alloy

Aging process	E _UP (N/mm)	σ _TS (MPa)	R _TY
165 °C/20 h	40.83	681.60	1.42
155 °C/30 h	63.98	679.76	1.45
145 °C/45 h	102.65	631.17	1.47

Fig. 4 The morphologies of the propagation region: a 145 °C, 45 h; b 165 °C, 20 h

Fig. 5 TEM images of the novel aluminum-lithium alloy aged at 145 °C, 35 h: a the precipitated phases; b the PFZ

Fig. 6 TEM images of the novel aluminum-lithium alloy aged at 145 °C, 45 h: a the precipitated phases; b the corresponding diffraction pattern of T1; c the PFZ

Fig. 7 TEM images of the novel aluminum-lithium alloy aged at 165 °C, 20 h: a the precipitated phases; b the amplification image of selected area (a); c the PFZ

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