Stacking-fault energy, mechanical twinning and strain hardening of Fe-18Mn-0.6C-(0, 1.5)Al twinning-induced plasticity steels during friction stir welding

2018 ◽  
Vol 148 ◽  
pp. 235-248 ◽  
Author(s):  
Seung-Joon Lee ◽  
Yufeng Sun ◽  
Hidetoshi Fujii
Keyword(s):  
Friction Stir Welding ◽  
Strain Hardening ◽  
Mechanical Twinning ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
Friction Stir

scholarly journals Correlation of Grain Size, Stacking Fault Energy, and Texture in Cu-Al Alloys Deformed under Simulated Rolling Conditions

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Ehab A. El-Danaf ◽  
Mahmoud S. Soliman ◽  
Ayman A. Al-Mutlaq
Keyword(s):  
Grain Size ◽  
Strain Hardening ◽  
Mechanical Twinning ◽  
Al Alloys ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
Wide Range ◽  
Orientation Density ◽  
Pure Cu ◽  
Strain Hardening Rate

The effect of grain size and stacking fault energy (SFE) on the strain hardening rate behavior under plane strain compression (PSC) is investigated for pure Cu and binary Cu-Al alloys containing 1, 2, 4.7, and 7 wt. % Al. The alloys studied have a wide range of SFE from a low SFE of 4.5 mJm−2for Cu-7Al to a medium SFE of 78 mJm−2for pure Cu. A series of PSC tests have been conducted on these alloys for three average grain sizes of ~15, 70, and 250 μm. Strain hardening rate curves were obtained and a criterion relating twinning stress to grain size is established. It is concluded that the stress required for twinning initiation decreases with increasing grain size. Low values of SFE have an indirect influence on twinning stress by increasing the strain hardening rate which is reflected in building up the critical dislocation density needed to initiate mechanical twinning. A study on the effect of grain size on the intensity of the brass texture component for the low SFE alloys has revealed the reduction of the orientation density of that component with increasing grain size.

scholarly journals Effects of rotational speed on the Al0.3CoCrCu0.3FeNi high-entropy alloy by friction stir welding

2020 ◽  
Vol 39 (1) ◽  
pp. 556-566 ◽  
Author(s):  
Po-Ting Lin ◽  
Chan-Sheng Wu ◽  
Chun-Hao Peng ◽  
Che-Wei Tsai ◽  
Yutaka S. Sato
Keyword(s):  
Friction Stir Welding ◽  
Cubic Boron Nitride ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
High Entropy Alloy ◽  
Electron Backscattered Diffraction ◽  
High Entropy ◽  
Practical Applications ◽  
Friction Stir ◽  
Microhardness Distribution

AbstractWelding and relevant studies are indispensable to employ high-entropy alloys for practical applications. In this study, Al0.3CoCrCu0.3FeNi high-entropy alloy with single FCC phase was used to make “bead-on-plate” friction stir welds at different rotational speeds, and the effects on microstructure and mechanical properties were studied. Several banded structures containing oxide or nitride particles were observed in the stir zone (SZ), and the chemical wear of the polycrystalline cubic boron nitride tool was confirmed. The microhardness distribution of the welds showed higher hardness in the SZ because of grain refinement and the presence of deformed grains. The electron backscattered diffraction results suggested that the high-entropy alloy with low stacking-fault energy experienced recrystallization during friction stir welding, which was similar to other conventional materials with low stacking-fault energy.

scholarly journals Effect of Stacking Fault Energy on the Grain Structure Evolution of FCC Metals During Friction Stir Welding

2020 ◽  
Vol 33 (7) ◽  
pp. 1001-1012 ◽  
Author(s):  
Xiaochao Liu ◽  
Yufeng Sun ◽  
Tomoya Nagira ◽  
Kohsaku Ushioda ◽  
Hidetoshi Fujii
Keyword(s):  
Friction Stir Welding ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
Grain Structure ◽  
Structure Evolution ◽  
Friction Stir ◽  
Fcc Metals

scholarly journals Effect of stacking fault energy on the restoration mechanisms and mechanical properties of friction stir welded copper alloys

2019 ◽  
Vol 162 ◽  
pp. 185-197 ◽  
Author(s):  
Akbar Heidarzadeh ◽  
Tohid Saeid ◽  
Volker Klemm ◽  
Ali Chabok ◽  
Yutao Pei
Keyword(s):  
Mechanical Properties ◽  
Copper Alloys ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
Friction Stir

Study on the Precipitation Behavior of Precipitates of 7075 Aluminum Alloy Friction Stir Welding Joint

2020 ◽  
Vol 1003 ◽  
pp. 37-46
Author(s):  
Hao Zhu ◽  
Shao Kang Dong ◽  
Ze Ming Ma ◽  
Jun Wang
Keyword(s):  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Strain Hardening ◽  
Strengthening Effect ◽  
7075 Aluminum Alloy ◽  
Friction Stir ◽  
Microhardness Distribution ◽  
Fine Grain ◽  
Fine Grain Strengthening ◽  
Precipitated Phases

In this work, the microhardness of 7075 aluminum alloy friction stir welding (FSW) joint was measured by a micro vickers hardness tester, the microstructure of the joints was characterised by microscope, the precipitated phases among the welding nugget zone (WNZ), thermal mechanical affected zone (TMAZ), heat affected zone (HAZ) were affirmed by X-ray diffractometer (XRD) and the lattice fringe of transmission electron microscopy (TEM) high resolution image. Based on this, the precipition behavior of precipitated phases was studied. The results show that the microhardness distribution of the 7075 aluminium alloy FSW joints is heterogeneous in comparison with the base metal (BM). The precipitates in the joint mainly include MgZn rod shape and AlCuMg in elliptical shape. In the WNZ, the main precipitate is AlCuMg, and the fine grain strengthening effect is better, so the microhardness in this zone is relatively high. In the TMAZ, the quantity of AlCuMg decreased while the MgZn2 increased relatively in comparison with the WNZ. At the same time, the effect of the fine grain strengthening was weakened, though the strain hardening increased. Therefore, the microhardness in the TMAZ still decreased. In the HAZ, the quantity of MgZn2 increased furtherly, and there is no strain hardening and fine grain strengthening, so the microhardness of the HAZ was the lowest among the FSW joints. Besides, through comparative tests, the optimal process parameters of friction stir welding of 7075 aluminum alloy were obtained.

Effect of Strain Hardening on the Joint Efficiency of an Al-Mg-Sc-Zr Alloy Subjected to Friction Stir Welding

2014 ◽  
Vol 922 ◽  
pp. 463-468
Author(s):  
Sergey Malopheyev ◽  
Vladislav Kulitskiy ◽  
Sergey Mironov ◽  
Daria Zhemchuzhnikova ◽  
Rustam Kaibyshev
Keyword(s):  
Friction Stir Welding ◽  
Strain Hardening ◽  
Initial Conditions ◽  
Welding Process ◽  
Weld Strength ◽  
Friction Stir ◽  
Joint Efficiency ◽  
Cold Rolled ◽  
Cold Worked ◽  
Hot Rolled

The microstructure and mechanical properties of friction stir welded Al-5.4Mg-0.2Sc-0.1Zr alloy were studied. Defect-free welds were produced in hot extruded, hot rolled and cold rolled initial conditions. Friction stir welding led to the formation of ultrafine-grained structure in stir zone that contributes to overall strengthening. Coherent Al3(Sc,Zr) dispersoids retain partially during welding process that provides a joint efficiency close to 100% in the hot extruded and hot rolled materials. In the cold-rolled state the joint efficiency was found to be only 64%. The relatively low weld strength of the cold rolled material was attributed to the elimination of strain hardening due to the formation of recrystallized structure. It was shown that full strength weld can be achieved in semi-finished products of Al-Mg-Sc alloys in cold-worked and stabilized states being equal to H323 and H341 tempering by friction stir welding.

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