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Abstract <p>The results of experimental studies on the structural features of butt joints of 1565chM alloy plates with a thickness of 25 mm obtained by single-sided friction stir welding are presented. It was found that the structure of the stir zone (weld metal) represents a dynamically and primarily recrystallized area. The grain size in the weld metal varies depending on the distance from the surface of the weld, ranging from 5.16 μm (upper part of the joint) to 2.93 μm (root part of the joint). The precipitation of intermetallic compounds in the stir zone for the Al–Mg system alloys contributes to the reduction of the average grain size. Within the grains, at about half the thickness of the plate, both chaotically distributed dislocations and dislocation clusters, predominantly in the form of dislocation walls, are observed. The scalar dislocation density at this level exceeds the values of scalar dislocation density in the upper and root parts of the weld. Overall, it can be noted that, in the stir zone of the 1565chM alloy plate joints, the microstructure at different levels of horizontal sections across the plate thickness is quite uniform, indicating a layer-by-layer transfer mechanism that is macroscopic.</p>

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Structure and Properties of Joints of Plates from 1565chM Alloy Made by Single-Sided Friction Stir Welding

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • V. V. Ovchinnikov,
  • A. E. Bykova,
  • T. Yu. Skakova

摘要

Abstract

The results of experimental studies on the structural features of butt joints of 1565chM alloy plates with a thickness of 25 mm obtained by single-sided friction stir welding are presented. It was found that the structure of the stir zone (weld metal) represents a dynamically and primarily recrystallized area. The grain size in the weld metal varies depending on the distance from the surface of the weld, ranging from 5.16 μm (upper part of the joint) to 2.93 μm (root part of the joint). The precipitation of intermetallic compounds in the stir zone for the Al–Mg system alloys contributes to the reduction of the average grain size. Within the grains, at about half the thickness of the plate, both chaotically distributed dislocations and dislocation clusters, predominantly in the form of dislocation walls, are observed. The scalar dislocation density at this level exceeds the values of scalar dislocation density in the upper and root parts of the weld. Overall, it can be noted that, in the stir zone of the 1565chM alloy plate joints, the microstructure at different levels of horizontal sections across the plate thickness is quite uniform, indicating a layer-by-layer transfer mechanism that is macroscopic.