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Nanomechanical properties of friction stir welded AA6082-T6 aluminum alloy

机译：搅拌摩擦焊接AA6082-T6铝合金的纳米力学性能

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摘要

Lightweight alloys are of major concern, due to their functionality and applications in transport and industry applications. Friction stir welding (FSW) is a solid-state welding process for joining aluminum and other metallic alloys and has been employed in aerospace, rail, automotive and marine industries. Compared to the conventional welding techniques, FSW produces joints which do not exhibit defects caused by melting. The objective of the present study is to investigate the surface hardness (H) and elastic modulus (E) in friction stir welded aluminum alloy AA6082-T6. The findings of the present study reveal that the welding process softens the material, since the weld nugget is the region where the most deformations are recorded (dynamic recrystallization, production of an extremely fine, equiaxial structure), confirmed by optical microscopy and reduced nanomechanical properties in the welding zone. A yield-type pop-in occurs upon low loading and represents the start of phase transformation, which is monitored through a gradual slope change of the load-displacement curve. Significant pile-up is recorded during nanoindentation of the alloy through SPM imaging.
机译：轻质合金由于其功能性以及在运输和工业应用中的应用而成为主要关注的问题。搅拌摩擦焊（FSW）是用于连接铝和其他金属合金的固态焊接工艺，已被用于航空航天，铁路，汽车和海洋工业。与传统的焊接技术相比，FSW产生的接头不会表现出由熔化引起的缺陷。本研究的目的是研究搅拌摩擦焊接铝合金AA6082-T6的表面硬度（H）和弹性模量（E）。本研究的发现表明，焊接过程使材料软化，因为焊接熔核是记录到最大变形的区域（动态再结晶，产生极细的等轴结构），这已通过光学显微镜确认并降低了纳米力学性能。在焊接区。屈服类型的弹跳发生在低载荷下，代表相变的开始，可通过载荷-位移曲线的逐渐变化的斜率进行监视。通过SPM成像在合金纳米压痕过程中记录到明显的堆积。

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  • 来源
    《Materials Science and Engineering》 |2011年第19期|p.1585-1589|共5页
  • 作者

    E.P. Koumoulos; C.A. Charitidis; N.M. Daniolos; D.I. Pantelis;

  • 作者单位

    National Technical University of Athens. Department of Chemical Engineering 9 Heroon, Polytechneiou St., Zografos, Athens, GR-157 80, Greece;

    National Technical University of Athens. Department of Chemical Engineering 9 Heroon, Polytechneiou St., Zografos, Athens, GR-157 80, Greece;

    National Technical University of Athens, Department of Naval Architecture and Marine Engineering 9 Heroon, Polytechneiou St., Zografos, Athens, GR-157 80, Greece;

    National Technical University of Athens, Department of Naval Architecture and Marine Engineering 9 Heroon, Polytechneiou St., Zografos, Athens, GR-157 80, Greece;

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  • 正文语种 eng
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  • 关键词

    friction stir welding; nanoindentation; aluminum alloy; nanohardness; elastic modulus; plasticity;

    机译：搅拌摩擦焊;纳米压痕铝合金;纳米硬度弹性模量可塑性;

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