Content Provider | MDPI |
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Author | Loginova, Irina Khalil, Asmaa Pozdniakov, Andrey Solonin, Alexey Zolotorevskiy, Vadim |
Abstract | The effect of pulse laser welding parameters and filler metal on microstructure and mechanical properties of the new heat-treatable, wieldable, cryogenic Al-4.7Mg-0.32Mn-0.21Sc-0.1Zr alloy were investigated. The optimum parameters of pulsed laser welding were found. They were 330–340 V in voltage, 0.2–0.25 mm in pulse overlap with 12 ms duration, and 2 mm/s speed and ramp-down pulse shape. Pulsed laser welding without and with Al-5Mg filler metal led to the formation of duplex (columnar and fine grains) as-cast structures with hot cracks and gas porosity as defects in the weld zone. Using Al-5Ti-1B filler metal for welding led to the formation of the fine grain structure with an average grain size of 4 ± 0.2 µm and without any weld defects. The average concentration of Mg is 2.8%; Mn, 0.2%; Zr, 0.1%; Sc, 0.15%; and Ti, 2.1% were formed in the weld. The ultimate tensile strength (UTS) of the welded alloy with AlTiB was 260 MPa, which was equal to the base metal in the as-cast condition. The UTS was increased by 60 MPa after annealing at 370 °C for 6 h that was 85% of UTS of the base alloy. |
File Size | 6027264 |
File Format | |
e-ISSN | 20754701 |
DOI | 10.3390/met7120564 |
Journal | Metals |
Issue Number | 12 |
Volume Number | 7 |
Language | English |
Publisher Date | 2017-12-14 |
Access Restriction | Open |
Subject Keyword | aluminum alloys electron microscopy stress/strain measurements laser methods grains and interfaces |
Content Type | Text |
Resource Type | Article |
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