Abstract Friction stir additive techniques (FSATs) constitute innovative approaches aimed at utilizing layer by layer additive manufacturing (AM) principle with solid state friction stir welding (FSW) technique. These constitute a special class of friction based additive techniques (FATs) and can be easily thought of as major breakthrough of metal additive manufacturing (MAM) domain. Ability of MAM techniques to be used for fabricating intricate parts has led them to be considered as a lucrative option for aviation, automotive, and marine sectors. However, fusion based MAM techniques have manifold limitations mainly owing to solidification related as well as poor shear strength issues. FATs overcome drawbacks of fusion based MAM methods chiefly because of their solid-state nature. FATs fabricate defect free components possessing superior structural and mechanical characteristics. Basic principles of additive manufacturing and FSW necessary for highlighting need and concept of FATs are introduced first. All FATs with their basic principles and specific merits are then presented. Special emphasis is given to two most effective FATs based upon FSW, i.e., FSATs which are friction stir additive manufacturing and additive friction stir (AFS). Aim of this work is to present a critical review of timeline and recent developments in the field of FSATs. In addition, challenges and future trends of these innovative techniques are highlighted followed by detailed discussion.

中文翻译：

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固态摩擦基金属增材制造新进展综述：搅拌摩擦添加剂技术

摘要 搅拌摩擦添加剂技术 (FSATs) 构成了旨在利用逐层增材制造 (AM) 原理和固态搅拌摩擦焊 (FSW) 技术的创新方法。这些构成了一类特殊的基于摩擦的增材技术 (FAT)，很容易被认为是金属增材制造 (MAM) 领域的重大突破。MAM 技术用于制造复杂零件的能力使其被视为航空、汽车和海洋部门的有利可图的选择。然而，基于融合的 MAM 技术具有多种局限性，主要是由于凝固相关以及较差的剪切强度问题。FAT 克服了基于融合的 MAM 方法的缺点，主要是因为它们的固态特性。FAT 可制造具有卓越结构和机械特性的无缺陷组件。首先介绍了突出需要和 FAT 概念所必需的增材制造和 FSW 的基本原理。然后介绍所有 FAT 及其基本原则和具体优点。特别强调了两种最有效的基于 FSW 的 FAT，即 FSAT，即摩擦搅拌增材制造和添加剂搅拌摩擦 (AFS)。这项工作的目的是对 FSAT 领域的时间表和最新发展进行批判性审查。此外，重点介绍了这些创新技术的挑战和未来趋势，然后进行了详细讨论。然后介绍所有 FAT 及其基本原则和具体优点。特别强调了两种最有效的基于 FSW 的 FAT，即 FSAT，即摩擦搅拌增材制造和添加剂搅拌摩擦 (AFS)。这项工作的目的是对 FSAT 领域的时间表和最新发展进行批判性审查。此外，重点介绍了这些创新技术的挑战和未来趋势，然后进行了详细讨论。然后介绍所有 FAT 及其基本原则和具体优点。特别强调了两种最有效的基于 FSW 的 FAT，即 FSAT，即摩擦搅拌增材制造和添加剂搅拌摩擦 (AFS)。这项工作的目的是对 FSAT 领域的时间表和最新发展进行批判性审查。此外，重点介绍了这些创新技术的挑战和未来趋势，然后进行了详细讨论。