...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Materials Science and Engineering >Relationship between the microstructure and mechanical properties of an equiatomic AlCoCrFeNi high-entropy alloy fabricated by selective electron beam melting
【24h】

Relationship between the microstructure and mechanical properties of an equiatomic AlCoCrFeNi high-entropy alloy fabricated by selective electron beam melting

机译：选择性电子束熔化制备的等原子AlCoCrFeNi高熵合金的组织与力学性能的关系

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Because of their superior properties, high-entropy alloys (HEAs) are considered promising novel structural materials that can substitute conventional alloys. From the viewpoint of future applications, it is important to explore methods for producing complex shaped products with HEAs. In this study, selective electron beam melting (SEBM) was employed for fabricating equiatomic AlCoCrFeNi HEA specimens, and their microstructures and mechanical properties were evaluated by comparing them with those of a conventionally cast specimen. Both cast and SEBM specimens dominantly consisted of a nano-lamellar mixture of disordered body-centered-cubic (BCC) and B2 (ordered BCC) phases. The face-centered cubic (FCC) phase was also precipitated at the grain boundaries of the B2/BCC mixture phases on the SEBM specimens. The fraction of the FCC phase at the bottom part of the SEBM specimen was higher than that at the top part. The preheating procedure-a process unique to SEBM-is responsible for the precipitation of the FCC phase, because of the long-term exposure at sufficiently high temperatures. As a result, the hardness of the SEBM specimens gradually decreased as we approached the bottom part of the specimens due to the increased fraction of the FCC phase, which had lower hardness than the B2/BCC phases. Further, the SEBM specimen exhibited much higher plastic deformability than the cast specimen, without significant loss of strength.
机译：由于其优越的性能，高熵合金（HEA）被认为是可以替代常规合金的有前途的新型结构材料。从未来的应用角度来看，探索用HEA生产复杂形状产品的方法很重要。在这项研究中，采用选择性电子束熔化（SEBM）制备等原子AlCoCrFeNi HEA试样，并通过与常规铸造试样进行比较来评估其微观结构和力学性能。铸造和SEBM标本均主要由无序体心立方（BCC）和B2（有序BCC）相的纳米层混合物组成。 SEBM标本上的B2 / BCC混合相的晶界处还沉淀了面心立方（FCC）相。 SEBM样品底部的FCC相分数高于顶部。由于在足够高的温度下长期暴露，预热程序（SEBM独有的一种过程）导致了FCC相的沉淀。结果，由于FCC相的分数增加，SEBM标本的硬度随着我们接近标本的底部而逐渐降低，而FCC相的分数比B2 / BCC相的硬度低。此外，SEBM样品比铸件具有更高的塑性变形能力，而强度没有明显降低。

著录项

  • 来源
    《Materials Science and Engineering》 |2016年第22期|39-46|共8页
  • 作者

    Hiroshi Shiratori; Tadashi Fujieda; Kenta Yamanaka; Yuichiro Koizumi; Kosuke Kuwabara; Takahiko Kato; Akihiko Chiba;

  • 作者单位

    Department of Materials Processing, Graduate School of Engineering, Tohoku University, 6-6-02, Aoba-yama, Aoba-ku, Sendai 980-8579, Japan,Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan;

    Center for Technology Innovation - Materials, Research & Development Group, Hitachi, Ltd., Hitachi 319-1292, Japan;

    Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan;

    Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan;

    Center for Technology Innovation - Materials, Research & Development Group, Hitachi, Ltd., Hitachi 319-1292, Japan;

    Center for Technology Innovation - Materials, Research & Development Group, Hitachi, Ltd., Hitachi 319-1292, Japan;

    Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan;

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

    High-entropy alloy; Selective electron beam melting; Casting; Microanalysis; Mechanical characterization;

    机译：高熵合金;选择性电子束熔化;铸件;微量分析机械特性;

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