Effect of Temperature on Tensile Properties of 6101 Al-alloy Wires

doi:10.11901/1005.3093.2020.155

Chinese Journal of Materials Research

2020, Vol. 34

Issue (10): 730-736 DOI: 10.11901/1005.3093.2020.155

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Effect of Temperature on Tensile Properties of 6101 Al-alloy Wires

SONG Wenshuo¹, SONG Zhuman², LUO Xuemei², ZHANG Guangping², ZHANG Bin¹(

)

1. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, China
2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

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SONG Wenshuo, SONG Zhuman, LUO Xuemei, ZHANG Guangping, ZHANG Bin. Effect of Temperature on Tensile Properties of 6101 Al-alloy Wires. Chinese Journal of Materials Research, 2020, 34(10): 730-736.

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Abstract

Tensile properties of a single-strand conductor of 6101 Al-alloy were investigated in the temperature range from -70℃ to 70℃. It is found that the 6101 Al-alloy wire has high strength and good deformation uniformity at the low temperature (-70℃). However, the yield strength and the ultimate tensile strength of the alloy exhibited a decreasing trend with the increasing testing temperature. The ultimate tensile strength and the yield strength of the alloy at 70℃ decreased by 10.9% and 9.3%, respectively, comparing with those of the counterparts tested at -70℃. From the analysis on the correlation of the work hardening rate and the yield strength with the temperature, it is found that the strain hardening rate of the alloy decreased with the increasing flow stress and the raising temperatures. In addition, the lattice friction stress has a strong correlation with temperature, which is the main factor affecting the yield strength of the alloy. Based on the comparison of the fitting calculated increment of the yield strength of the alloy to the corresponding experimental results, a model about the relation between the yield strength of the alloy and the service temperature was obtained, by which the appropriate yield strength of the alloy at different service temperatures can be predicted.

Key words: metallic materials 6101 aluminum alloy conductor strength temperature strain hardening rate

Received: 09 May 2020

ZTFLH:

TB31

Fund: National Natural Science Foundation of China(51671050);National Natural Science Foundation of China(51971060)

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	Wenshuo SONG
	Zhuman SONG
	Xuemei LUO
	Guangping ZHANG
	Bin ZHANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.155 OR https://www.cjmr.org/EN/Y2020/V34/I10/730

Fig.1 Schematic illustration of dimensions of the tensile specimens

Fig.2 TEM images of cross-sectional (a) and longitudinal-sectional (b) of the as-received specimens

Fig.3 Stress-strain curves of the specimens tested at different temperatures engineering (a) and true stress-strain curve at the true strain range of 0.2%~0.35%(b)

Fig.4 Relationship between ultimate tensile strength and yield strength (a), uniform elongation (b) and temperature

Fig.5 SEM images of the fracture surfaces of the specimens tensiled at different temperatures (a) -70℃, (b) -50℃, (c) -25℃, (d) 25℃, (e) 50℃, (f) 70℃

Fig.6 SEM images of the specimen surfaces close to fracture, tensiled at -70℃ (a) and 70℃ (b)

Fig.7 Curves of θvs (σ- $σ 0.2$ ) of the specimens tensiled at different temperatures

T/℃	X	Y	$k 1$	$k 2$	Formula of strain hardening rate
-70	28.5	3389	1.674	79.275	θ=39181(1-σ/330)
-50	26.1	3309	1.751	84.521	θ=41108(1-σ/323)
-25	27.0	3346	1.684	82.617	θ=39408(1-σ/318)
25	19.5	2663	1.765	91.043	θ=41311(1-σ/303)
50	17.4	3171	2.378	121.494	θ=55656(1-σ/305)
70	16.0	2247	1.734	93.625	θ=40586(1-σ/289)

Table 1 Parameters of the specimens tensile loaded at different temperatures

Fig.8 Ratios of $k 1 / k 2$ under different temperatures

Fig.9 Experimental and calculated data of yield streng-th increment of the specimens

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