Size Effect on Mechanical Property for Cold-Draw Micron-sized Molybdenum-Wires

doi:10.11901/1005.3093.2015.104

Chinese Journal of Materials Research

2015, Vol. 29

Issue (7): 511-516 DOI: 10.11901/1005.3093.2015.104

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Size Effect on Mechanical Property for Cold-Draw Micron-sized Molybdenum-Wires

Guihua REN^1,²,Haifeng TAN¹,Xiaozhe FENG¹,Bin ZHANG^1,^**(

)

1. Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education), Northeastern University, Shenyang 110819, China
2. School of Mechanical and Electronic Engineering, Hubei Institute of Technology, Huangshi 435003, China

Cite this article:

Guihua REN,Haifeng TAN,Xiaozhe FENG,Bin ZHANG. Size Effect on Mechanical Property for Cold-Draw Micron-sized Molybdenum-Wires. Chinese Journal of Materials Research, 2015, 29(7): 511-516.

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Abstract

Cold-draw molybdenum wires with diameters of 125, 140 and 160 mm were selected as a model material. Tensile tests and tension-tension fatigue tests under stress control were conducted to investigate mechanical performance of the micron-sized Mo wires. While the fractured surfaces of the wires were examined by scanning electron microscopy. The experimental results show that both of tensile and fatigue strengths under stress control decrease with the decreasing wire diameter. The size effect on fatigue performance of the Mo wire can be attributed to the difference of the quantity of grains along the radial direction, which leads to that the smaller the wire diameter the more sensitive to the fatigue crack or defect on the Mo wire surface, and thereby, the shorter the fatigue life.

Key words: metallic materials molybdenum wires tension properties fatigue fracture size effect

Received: 26 February 2015

Fund: *Supported by the National Natural Science Foundation of China Nos. 51171045 & 51371047 and the Foundamental Research Funds for the Central Universities No. N130810003.

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	Guihua REN
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	Xiaozhe FENG
	Bin ZHANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.104 OR https://www.cjmr.org/EN/Y2015/V29/I7/511

Fig.1 EBSD characterization of microstructure of Mo wire with diameter of 125 mm (a) grain orientation map, (b) IPF, (c) grain size distribution map and (d) GB misorientation angle along the drawing direction

Fig.2 Mechanical properties of Mo wires with different diameters (a) tensile engineering stress-strain curves, (b) variation of tensile strength of Mo wires with wire diameter

Fig.3 Typical SEM images of tensile fracture surfaces of Mo wires with a diameter of 125 mm observed at low (a) and high magnifications (b)

Fig.4 Relation between applied stress amplitude and fatigue life of the Mo wires

Fig.5 SEM images of the fracture surfaces of the molybdenum wires with diameter of 125 mm after (a) 2.88×10³, (c) 3.39×10⁴ and (e) 9.44×10⁵ cycles. (b), (d) and (f) are the corresponding observations at high magnification

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