The relationship among microstructure evolution, mechanical property and in situ reaction mechanisms in preparing Cu–1.6wt%TiB2 alloys
The relationship among microstructure evolution, mechanical property and in situ reaction mechanisms in preparing Cu–1.6wt%TiB2 alloys
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DOI：
10.1016/j.matchemphys.2012.11.014
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发表时间：
2013-02
影响因子：
4.6
通讯作者：
M. Guo;M. P. Wang
中科院分区：
文献类型：
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作者：
M. Guo;M. P. Wang
采用机械合金化和热处理相结合的方法制备了Cu-1.6wt%TiB2合金。研究了Cu-1.6wt%TiB2合金的原位反应机制与组织演变、力学性能之间的关系。结果表明，在750 °C热处理40 h和60 h后，Cu-B-Ti合金粉末中的B和Ti元素发生原位反应，在700 °C热处理后硬度呈上升趋势，最高可达335 HV，而在500 °C和900 °C热处理后硬度呈下降趋势;在500 °C热处理后，铜基体中形成了大量粗大的B颗粒，随着热处理时间的延长，形成的B颗粒的数量和尺寸显著增加，但在700 °C和900 °C热处理后，都可以形成大量的反应边界（或TiB 2膜）和更细小的TiB 2颗粒。建立并分析了不同分布水平的Cu-B和Cu-Ti合金胶束之间不同的原位反应模型。
The Cu–1.6wt%TiB2alloys have been prepared by combining mechanical alloying and heat treatment. The relationship among microstructure evolution, mechanical property and in situ reaction mechanisms in synthesizing Cu–1.6wt%TiB2alloys was investigated. It is shown that the temperature 750 °C measured by DSC can cause the occurrence of in situ reaction between B and Ti elements in the Cu–B–Ti alloy powders ball milled for 40 or 60 h; An upward trend of the hardness appears after heat treatment at 700 °C, and the highest value reaching 335HV, but a downward trend appears after heat treatment at either 500 °C or 900 °C; Many coarse B particles were formed in the copper matrix after heat treatment at 500 °C, the number and size of the formed B particles significantly increases with increasing time, but many reaction boundaries (or TiB2films) and finer TiB2particles can be formed after heat treatment at both 700 °C and 900 °C. The different in situ reaction models between Cu–B and Cu–Ti alloy micelles with different distribution levels were established and analyzed.