Electroplastic Tensile Behavior of 5A90 Al–Li Alloys

doi:10.1007/s40195-014-0086-7

Abstract

Abstract:

The electroplastic (EP) tensile properties of 5A90 Al–Li alloys compared with thermal tension were investigated. The microstructural variation at different conditions was observed by SEM and TEM. The current density significantly influences the elongation and the flow stress. With increasing current density, wider and deeper dimples on the fracture surfaces and less dislocation density and pile-ups in the EP tension samples were observed compared with room-temperature and thermal tension, which indicates the plasticity improvement and flow stress reduction. The EP effect (EPE) mainly results from a comprehensive function of Joule heating and pure EPE. Among them, Joule heating effect is perhaps a dominant factor.

Key words: 5A90 Al–Li alloys, Electroplastic effect, Tensile properties, Microstructure

Pengchao Song, Xifeng Li, Wei Ding, Jun Chen. Electroplastic Tensile Behavior of 5A90 Al–Li Alloys[J]. Acta Metallurgica Sinica (English Letters), 2014, 27(4): 642-648.

Figures/Tables 7

References 23

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Tensile conditions	Current density (A/mm²)	Temperature (°C)	Elongation (%)	Yield stress σ_s (MPa)	Ultimate tensile stress σ_b (MPa)
Room temperature	0	15	24.1	145	385
EP tension	2.17	–	25.9	144	378
	3.47	–	26.1	142	374
	4.76	–	29.2	119	347
	9.44	110	36.1	114	294
	12.47	210	38.6	110	220
	14.72	290	60.1	52	158
	16.11	320	51.9	48	136
Thermal tension	–	110	32.2	201	318
	–	210	34.9	196	229
	–	290	54.4	123	127

Tensile conditions	Current density (A/mm²)	Temperature (°C)	Elongation (%)	Yield stress σ_s (MPa)	Ultimate tensile stress σ_b (MPa)
Room temperature	0	15	24.1	145	385
EP tension	2.17	–	25.9	144	378
	3.47	–	26.1	142	374
	4.76	–	29.2	119	347
	9.44	110	36.1	114	294
	12.47	210	38.6	110	220
	14.72	290	60.1	52	158
	16.11	320	51.9	48	136
Thermal tension	–	110	32.2	201	318
	–	210	34.9	196	229
	–	290	54.4	123	127

Strain	Temperature (°C)	Flow stress			k₁ (%)
Strain	Temperature (°C)	σ₁ (MPa)	σ₂ (MPa)	σ (MPa)	k₁ (%)
0.192	110	274.0	310.3	374.1	63.8
0.211	210	215.8	239.4	383.2	79.9
0.236	290	53.4	91.5	383.7	88.5

Strain	Temperature (°C)	Flow stress			k₁ (%)
Strain	Temperature (°C)	σ₁ (MPa)	σ₂ (MPa)	σ (MPa)	k₁ (%)
0.192	110	274.0	310.3	374.1	63.8
0.211	210	215.8	239.4	383.2	79.9
0.236	290	53.4	91.5	383.7	88.5

EP tests		Isothermal tests		Room-temperature tests	k₂ (%)
Current density	Elongation (%)	Temperature (°C)	Elongation (%)	Elongation (%)	k₂ (%)
9.44	36.1	110	32.2	24.1	67.5
12.47	38.6	210	34.9		74.4
14.72	60.1	290	54.4		84.1