Transition in Deformation Mechanism during High-Temperature Tensile Testing of Friction-Stir-Processed 5083 Aluminum Alloy

In this study, 5083 aluminum alloy plates with a thickness of 3mm are friction stir welded and the microstructure and mechanical properties of the joints were characterized. In particular, tensile behavior of the joints is examined at 77K. It is found that defect-free joints can be obtained under a tool rotational rate of 800rpm and a welding speed of 60mm/min. The friction stirring welds exhibit finer microstructure and higher hardness than that of the base material due to the grain refinement. The ultimate tensile strength (UTS) and elongation of the joints measured at 298K are 316MPa and 21.3%, which are nearly equal to those of the base material. With the tensile test temperature decreasing to 77K, UTS and elongation of both the base material and joints increase. Comparing with tensile testing at 298K, dimples on the fracture surface of the samples tested at 77K are more uniform in distribution. The improvement of the mechanical properties of specimens at low temperature is related to the inactivation of planar slip and the strengthening of strain hardening.

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Weibull Statistics of Tensile-Shear Strength of 5083 Aluminum Alloy after Friction Stir Spot Welding

MATERIALS TRANSACTIONS ◽

10.2320/matertrans.m2014281 ◽

2015 ◽

Vol 56 (1) ◽

pp. 54-60 ◽

Cited By ~ 5

Author(s):

Chia-Wei Lin ◽

Fei-Yi Hung ◽

Truan-Sheng Lui ◽

Li-Hui Chen

Keyword(s):

Shear Strength ◽

Aluminum Alloy ◽

Spot Welding ◽

Friction Stir Spot Welding ◽

Tensile Shear Strength ◽

Tensile Shear ◽

Weibull Statistics ◽

Friction Stir ◽

5083 Aluminum Alloy

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High Temperature Tensile Testing Apparatus for Industrial Ceramics Characterization

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.132-136.667 ◽

1997 ◽

Vol 132-136 ◽

pp. 667-669 ◽

Cited By ~ 1

Author(s):

G. Bisson ◽

O. Regent

Keyword(s):

High Temperature ◽

Tensile Testing ◽

Testing Apparatus ◽

High Temperature Tensile

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Further experiments and modeling for microscale compression molding of metals at elevated temperatures

Journal of Materials Research ◽

10.1557/jmr.2007.0252 ◽

2007 ◽

Vol 22 (7) ◽

pp. 1839-1848 ◽

Cited By ~ 12

Author(s):

J. Jiang ◽

W.J. Meng ◽

G.B. Sinclair ◽

E. Lara-Curzio

Keyword(s):

High Temperature ◽

Aspect Ratio ◽

Tensile Testing ◽

Elevated Temperatures ◽

Low Cost ◽

Mold Insert ◽

Compression Molding ◽

Mechanics Model ◽

Replication Technique ◽

High Temperature Tensile

Replication of metallic high-aspect-ratio microscale structures (HARMS) by compression molding has been demonstrated recently. Molding replication of metallic HARMS can potentially lead to low-cost fabrication of a wide variety of metal-based microdevices. Understanding the mechanics of metal micromolding is critical for assessing the capabilities and limitations of this replication technique. This paper presents results of instrumented micromolding of Al. Measured molding response was rationalized with companion high-temperature tensile testing of Al using a simple mechanics model of the micromolding process. The present results suggest that resisting pressure on the mold insert during micromolding is governed primarily by the yield stress of the molded metal at the molding temperature and a frictional traction on the sides of the insert. The influence of strain rate is also considered.

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