Effect of Nitrogen on Properties of TiAl-TiB2 Composite Material Synthesized by Nitrogen Shock Mechanical Alloying and Spark Plasma Activated Sintering
Effect of Nitrogen on Properties of TiAl-TiB2 Composite Material Synthesized by Nitrogen Shock Mechanical Alloying and Spark Plasma Activated Sintering
复制标题
氮对氮冲击机械合金化火花等离子体活化烧结TiAl-TiB2复合材料性能的影响
DOI：
10.2497/jjspm.44.542
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
T. Abe
中科院分区：
文献类型：
--
作者：
H. Hashimoto;Hiraku Sato;Sundeep Chauhan;T. Abe
作者曾发现在Ti-Al粉末混合物机械合金化过程中，在球磨气氛中同时通入氮气，促进了合金粉末的合成，并将此过程命名为“氮冲击机械合金化”。通过X射线衍射分析证实，在通过氮气冲击MA合成的合金粉末的烧结体中形成氮化物Ti_2AlN。采用氮气冲击MA技术对Ti、Al和B粉末进行处理，制备了Ti-Al-B合金粉末，并采用放电等离子体活化烧结技术对合金粉末进行了烧结，为了研究氮对烧结体组织和性能的影响。添加硼是为了形成细TiB 2颗粒，其强化基体以及氮化物。结果发现，合金粉末中的氮促进粉末的非晶化。还发现氮化物增加烧结体的硬度和杨氏模量。然而，过量形成的氮化物使得烧结体的显微结构不均匀。
The authors formerly found out that intercurrent introduction of nitrogen gas into the milling atmosphere during mechanical alloying of Ti-Al powder mixture promotes the synthesis of alloy powder and named this process "nitrogen shock mechanical alloying". It was confirmed by x-ray diffraction analysis that nitride, Ti2AIN was formed in sintered bodies of the alloy powder synthesized by the nitrogen shock MA. It is expected that TiAl matrix can be strengthened by the nitride, if the nitride precipitates in the form of fine particles dispersed in the matrix.In this study, the nitrogen shock MA was applied to a mixture of Ti, Al and B powders to make a Ti-Al-B alloy powder and the alloy powder was consolidated by spark plasma activated sintering, in order to investigate effects of nitrogen on the microstructure and properties of sintered bodies. Boron was added in expectation of the formation of fine TiB2 particles which strengthen the matrix as well as the nitride. As a result, it was found that nitrogen taken in the alloy powder enhances amorphization of the powder. It was also found that the nitride increases hardness and Young's modulus of the sintered bodies. However, the nitride formed excessively made the microstructure of the sintered bodies uneven.