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首页> 外文期刊>Materials Science and Engineering >Room and ultrahigh temperature structure-mechanical property relationships of tungsten alloys formed by field assisted sintering technique (FAST)
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Room and ultrahigh temperature structure-mechanical property relationships of tungsten alloys formed by field assisted sintering technique (FAST)

机译：场辅助烧结技术（FAST）形成的钨合金的室温和超高温结构-力学性能关系

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摘要

Tungsten based alloys have become of critical importance in a number of applications including plasma-facing materials in nuclear fusion reactors, rocket nozzles for aerospace applications, and in kinetic energy penetrators in the defense industry. Formation of components for these uses by powder metallurgical techniques has proven challenging, due to tungsten's relatively poor sinterability. Here we report the use of field assisted sintering technique (FAST) to produce high density, fine grain alloys with mechanical properties comparable or superior to that of components produced by conventional techniques. Alloys of pure tungsten, W-3 vol%TiC, W-5 vol%TiC, and W-10 vol%Ta were synthesized at 2100 ℃, 35 MPa for 25 min using FAST. Microstructural characterization revealed effective reduction of grain size with TiC addition and preferential diffusion of oxygen into the center of tantalum particles in tantalum containing alloys. Tensile testing of alloys revealed TiC addition to W resulted in substantially improved ultimate tensile strength at the cost of ductility in comparison at temperatures up to 1926 ℃ (3500 °F) however this strengthening effect was lost at 2204 ℃ (4000 ℉). Addition of 10 vol%Ta to W resulted in reduced hardness at room temperature, but substantially increased yield strength at the cost of slightly reduced ductility at 1926 ℃ and 2204 ℃.
机译：钨基合金已在许多应用中变得至关重要，这些应用包括核聚变反应堆中面向等离子体的材料，航空航天应用的火箭喷嘴以及国防工业中的动能穿透器。由于钨的相对较差的可烧结性，通过粉末冶金技术形成用于这些用途的组分已被证明具有挑战性。在这里，我们报告了使用场辅助烧结技术（FAST）来生产高密度，细晶粒合金的机械性能，该合金的性能可与传统技术生产的部件相比或更高。使用FAST在2100℃，35 MPa下25分钟合成了纯钨，W-3 vol％TiC，W-5 vol％TiC和W-10 vol％Ta的合金。显微组织表征表明，通过添加TiC可以有效地减小晶粒尺寸，并且优先将氧气扩散到含钽合金中的钽颗粒中心。合金的拉伸试验表明，与在1926℃（3500°F）的温度下相比，向W中添加TiC会以延展性为代价显着提高了极限抗拉强度，但在2204℃（4000℉）时失去了这种强化作用。在钨中添加10 vol％Ta会降低室温下的硬度，但以1926℃和2204℃的塑性稍有下降为代价，会显着提高屈服强度。

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  • 来源
    《Materials Science and Engineering》 |2016年第30期|701-712|共12页
  • 作者

    Paul N. Browning; Sven Alagic; Anil Kulkarni; Lawrence Matson; Jogender Singh;

  • 作者单位

    Pennsylvania State University, Department of Materials Science and Engineering, State College, PA-16801, United States,Pennsylvania State University, Applied Research Laboratory, State College, PA-16801, United States;

    Pennsylvania State University, Department of Materials Science and Engineering, State College, PA-16801, United States,Pennsylvania State University, Applied Research Laboratory, State College, PA-16801, United States;

    Pennsylvania State University, Department of Nuclear and Mechanical Engineering, State College, PA-16801, United States;

    Materials and Manufacturing Directorate, Wright Patterson Air Force Base, Dayton, OH, United States;

    Pennsylvania State University, Department of Materials Science and Engineering, State College, PA-16801, United States,Pennsylvania State University, Applied Research Laboratory, State College, PA-16801, United States;

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

    Field assisted sintering; Spark plasma sintering; High-temperature materials; Refractory metals; Mechanical properties; Tantalum;

    机译：现场辅助烧结;火花等离子体烧结;高温材料;难熔金属;机械性能钽;

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