Thermal history and microstructure during friction stir welding of Al-Mg alloy

Date

2016-09-01

Author

Sheikh-Ahmad, J. Y.
Ozturk, F.
Jarrar, F.
Evis, Zafer

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

141
views

0
downloads

In this study, a commercial aluminum-magnesium alloy was friction stir welded (FSW) at a constant rotational speed of 1016 rpm and different welding speeds from 50 to 400 mm/min. Temporal thermal histories of the process were recorded at different locations from the weld line and transformed to spatial temperature distribution near the weld line. Tensile and microhardness measurements were also performed and the microstructure in the weld zone was investigated. Results of this revealed that an increase in welding speed causes a decrease in the stir zone temperature, which leads to a decrease in the stir zone grain size. As a result, both tensile strength and hardness increased with an increase in welding speed. Dynamic recrystallization and post-weld static grain growth were the controlling factors of stir zone grain size. The grain size correlated closely with the Zener-Hollomon parameter. Slow cooling resulted in larger post-weld grain size than what is normally expected.

Subject Keywords

Control and Systems Engineering, Mechanical Engineering, Industrial and Manufacturing Engineering, Software, Computer Science Applications

URI

https://hdl.handle.net/11511/44219

Journal

INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY

DOI

https://doi.org/10.1007/s00170-015-8239-z

Collections

Department of Engineering Sciences, Article

Suggestions

OpenMETU
Core

Investigating the formation of intermetallic compounds during friction stir welding of magnesium alloy to aluminum alloy in air and under liquid nitrogen Mofid, M. A.; Abdollah-zadeh, A.; Gür, Cemil Hakan (Springer Science and Business Media LLC, 2014-03-01) This research demonstrates the use of submerged friction stir welding under liquid nitrogen as an alternative and improved method for creating fine-grained welds, and hence, to alleviate formation of intermetallic phases. Magnesium alloy and aluminum alloy were joined by friction stir welding in two environments, namely air and liquid nitrogen, with 400 rpm rotation and 50 mm/min travel speed. The temperature profile, microstructure, scanning electron microscope energy dispersive X-ray spectroscopy analysis...
Nonlinear time-varying dynamic analysis of a spiral bevel geared system Yavuz, Siar Deniz; Sarıbay, Zihni Burcay; Ciğeroğlu, Ender (Springer Science and Business Media LLC, 2018-06-01) In this paper, a nonlinear time-varying dynamic model of a drivetrain composed of a spiral bevel gear pair, shafts and bearings is developed. Gear shafts are modeled by utilizing Timoshenko beam finite elements, and the mesh model of a spiral bevel gear pair is used to couple them. The dynamic model includes the flexibilities of shaft bearings as well. Gear backlash and time variation of mesh stiffness are incorporated into the dynamic model. Clearance nonlinearity of bearings is assumed to be negligible, w...
Pressure prediction on a variable-speed pump controlled hydraulic system using structured recurrent neural networks KILIÇ, Ergin; Dölen, Melik; Çalışkan, Hakan; Koku, Ahmet Buğra; Balkan, Raif Tuna (Elsevier BV, 2014-05-01) This paper presents a study to predict the pressures in the cylinder chambers of a variable-speed pump controlled hydraulic system using structured recurrent neural network topologies where the rotational speed of the pumps, the position and the average velocity of the hydraulic actuator are used as their inputs. The paper elaborates the properties of such networks in extended time periods through detailed simulation- and experimental studies where black-box modeling approaches generally fail to yield accep...
Thermal characterization of crude oils by pressurized differential scanning calorimeter (PDSC) Kök, Mustafa Verşan; Nurgaliev, Danis K. (Elsevier BV, 2019-06-01) In this research, pressurized differential scanning calorimeter (PDSC) were used to estimate the thermal and kinetic behaviour of two different crude oils from Tatarstan oil fields under three different pressures (100, 600, 2000 kPa) at a constant heating rate (10 degrees C/min). The heat flow curves of both crude oils indicated two reaction regions known as low temperature oxidation (LTO) and high temperature oxidation (HTO). The reaction intervals were shifted to lower temperature regions with the increas...
High-performance parallel hexapod-robotic light abrasive grinding using real-time tool deflection compensation and constant resultant force control Latifinavid, Masoud; Donder, Abdulhamit; Konukseven, Erhan İlhan (Springer Science and Business Media LLC, 2018-06-01) In robotic grinding, significant tool deflection occurs due to the lower stiffness of the manipulator and tool, compared with operation by universal grinding machines. Tool deflection during robotic grinding operation causes geometrical errors in the workpiece cross section. Also, it makes difficult to control the grinding cutting depth. In this study, a method is proposed for calculation of the tool deflection in normal and tangential directions based on grinding force feedback in these directions. Based o...

Citation Formats

J. Y. Sheikh-Ahmad, F. Ozturk, F. Jarrar, and Z. Evis, “Thermal history and microstructure during friction stir welding of Al-Mg alloy,” INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY, pp. 1071–1081, 2016, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/44219.