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Thermo-mechanical post-treatment: A strategic approach to improve microstructure and mechanical properties of cold spray additively manufactured composites

机译：热机械后处理：一种战略方法，以改善冷喷涂添加剂制造的复合材料的微观结构和机械性能

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摘要

In recent time, cold spray additive manufacturing (CSAM) has emerged as a promising solid state manufacturing technique to produce thick deposits of pure metal, alloys and composites with limited risk of oxidation, phase transformations, and residual thermal stresses. This preliminary study highlights an effective post spray thermo-mechanical treatment (TMT) that can be used to efficiently heal out splat boundaries and rejuvenate mechanical properties of the as-sprayed composites. CSAMed B4C/Al composite was subjected to a series of TMTs via heating at similar to 500 degrees C in the furnace for 2 h followed by unidirectional rolling treatments with thickness reductions of 20, 40 and 60% in 1, 2 and 3 passes, respectively. Microstructural investigations revealed that as the thickness reduction was increased from 20%, matrix grains were extensively refined due to continuous dynamic recrystallization (CDRX). Moreover, bonding between Al/Al splats and B4C/Al interfaces was remarkably improved due to enhanced inter-particle diffusion activity. Consequently, yield strength (YS), ultimate tensile strength (UTS) and elongation (EL) of the as-sprayed composite were enhanced simultaneously. The TMTed sample with thickness reduction of 60% showed highest values of UTS and EL compared with the corresponding values of as-sprayed and conventionally heat treated samples. (C) 2018 Elsevier Ltd. All rights reserved.
机译：近年来，冷喷涂添加剂制造（CSAM）已成为一种有前途的固态制造技术，该技术可生产纯金属，合金和复合材料的厚沉积物，且氧化，相变和残余热应力的风险有限。这项初步研究着重介绍了一种有效的喷涂后热机械处理（TMT），可用于有效治愈飞溅的边界并恢复喷涂后复合材料的机械性能。通过将CSAMed B4C / Al复合材料在炉中在类似于500摄氏度的温度下加热2小时，然后进行单向轧制，分别在1、2和3道次中将厚度减小20％，40％和60％，进行一系列的TMT 。显微组织研究表明，随着厚度减少从20％增加，由于连续动态重结晶（CDRX），基体晶粒得到了广泛的细化。此外，由于增强的颗粒间扩散活性，显着改善了Al / Al片与B4C / Al界面之间的结合。因此，喷涂复合材料的屈服强度（YS），极限抗拉强度（UTS）和伸长率（EL）同时提高。与喷涂和常规热处理的样品的相应值相比，厚度减少60％的TMTed样品显示出最高的UTS和EL值。 （C）2018 Elsevier Ltd.保留所有权利。

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  • 来源
    《Materials & design》 |2018年第10期|287-299|共13页
  • 作者

    Tariq N. H.; Gyansah L.; Qiu X.; Du H.; Wang J. Q.; Feng B.; Yan D. S.; Xiong T. Y.;

  • 作者单位

    Chinese Acad Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China;

    Chinese Acad Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China;

    Chinese Acad Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China;

    Chinese Acad Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China;

    Chinese Acad Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China;

    Chinese Acad Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China;

    Chinese Acad Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China;

    Chinese Acad Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Additive manufacturing; Cold spraying; Thermo-mechanical treatment; Composite;

    机译：增材制造;冷喷涂;热机械处理;复合材料;

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