...
首页> 外文期刊>Materials Science and Engineering >Comparative study of the microstructures and mechanical properties of direct laser fabricated and arc-melted Al_xCoCrFeNi high entropy alloys
【24h】

Comparative study of the microstructures and mechanical properties of direct laser fabricated and arc-melted Al_xCoCrFeNi high entropy alloys

机译:直接激光制造和电弧熔化的Al_xCoCrFeNi高熵合金的显微组织和力学性能的比较研究

获取原文
获取原文并翻译 | 示例
           

摘要

High entropy alloys (HEA) are a relatively new metal alloy system that have promising potential in high temperature applications. These multi-component alloys are typically produced by arc-melting, requiring several remelts to achieve chemical homogeneity. Direct laser fabrication (DLF) is a rapid prototyping technique, which produces complex components from alloy powder by selectively melting micron-sized powder in successive layers. However, studies of the fabrication of complex alloys from simple elemental powder blends are sparse. In this study, DLF was employed to fabricate bulk samples of three alloys based on the Al_xCoCrFeNi HEA system, where x was 0.3, 0.6 and 0.85 M fraction of Al. This produced FCC, FCC/BCC and BCC crystal structures, respectively. Corresponding alloys were also produced by arc-melting, and all microstructures were characterised and compared longitudinal and transverse to the build/solidification direction by x-ray diffraction, glow discharge optical emission spectroscopy and scanning electron microscopy (EDX and EBSD). Strong similarities were observed between the single phase FCC and BCC alloys produced by both techniques, however the FCC/BCC structures differed significantly. This has been attributed to a difference in the solidification rate and thermal gradient in the melt pool between the two different techniques. Room temperature compression testing showed very similar mechanical behaviour and properties for the two different processing routes. DLF was concluded to be a successful technique to manufacture bulk HEA's.
机译:高熵合金(HEA)是一种相对较新的金属合金系统,在高温应用中具有广阔的发展潜力。这些多组分合金通常是通过电弧熔化生产的,需要多次重熔才能实现化学均匀性。直接激光制造(DLF)是一种快速成型技术,它通过在连续的层中选择性地熔化微米级的粉末,从合金粉末中生产复杂的零件。然而,由简单的元素粉末混合物制造复杂合金的研究很少。在这项研究中,基于Al_xCoCrFeNi HEA系统,DLF被用于制造三种合金的块状样品,其中x为Al的0.3、0.6和0.85M。这分别产生了FCC,FCC / BCC和BCC晶体结构。还通过电弧熔化生产了相应的合金,并通过X射线衍射,辉光放电光发射光谱法和扫描电子显微镜(EDX和EBSD)对所有微观结构进行了表征,并纵向和横向比较了建立/凝固方向。两种技术生产的单相FCC和BCC合金之间都具有很强的相似性,但是FCC / BCC的结构差异很大。这归因于两种不同技术之间熔池中凝固速率和热梯度的差异。室温压缩测试显示出两种不同加工路线的机械行为和性能非常相似。结论是DLF是制造批量HEA的成功技术。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号