High strength W/TiNi micro-laminated composite with transformation-mediated ductility

High strength W/TiNi micro-laminated composite with transformation-mediated ductility
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具有相变介导延展性的高强度 W/TiNi 微层压复合材料

DOI:
10.1016/j.matdes.2016.06.013
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发表时间:
2016-09
期刊:
影响因子:
8.4
通讯作者:
Cui Lishan
Cui Lishan
中科院分区:
材料科学1区
文献类型:
--
作者:
Shao Yang;Yu Kaiyuan;Jiang Daqiang;Yu Cun;Ren Yang;Jiang Xiaohua;Guo Fangmin;Cui Lishan

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采用真空热压和后续锻造工艺制备了W/TiNi层状复合材料。W和TiNi组分的厚度分别约为250%μm和80%μm,它们的界面化学成分尖锐,混合可以忽略不计。该材料在压缩试验中表现出两个屈服平台和良好的强塑性组合。在此情况下,用X射线技术证明了这种异常屈服现象与TiNi层的可逆热弹性相变有关。这种机制还通过抑制W中的裂纹扩展来提高材料的损伤容忍度。
A laminated W/TiNi composite is fabricated by hot pressing under vacuum and subsequent forging. The W and TiNi constituents are about 250 μm and 80 μm respectively in thicknesses and their interfaces are chemically sharp with negligible intermixing. The material exhibits two yielding plateaus and excellent strength-ductility combination during compression tests.In situX-ray technique is employed to demonstrate that the unusual yielding phenomenon is related to the reversible thermoelastic phase transformation of TiNi layers. Such mechanisms also contribute to the damage tolerance of the materials by inhibiting crack propagation in W.
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