Abstract A TiB2–ZrB2 composite was synthesized by 20-h mechanical alloying (MA) of a mixture of Zr, Ti, and B powders in a planetary ball mill (Zr:Ti:B molar ratio = 1:1:4; ball-to-powder weight ratio = 20:1). Milling was performed at 500 rpm in an argon atmosphere using a ZrO2 vial and balls and was followed by pressureless sintering at 1230 °C. The effect of milling time on MA-induced phase changes was investigated by X-ray diffraction, and the microstructure development of powder mixtures and the TiB2–ZrB2 composite was monitored by field emission scanning electron microscopy and transmission electron microscopy. MA reduced the activation energy for the transformation of the above powder mixture, allowing its complete conversion into TiB2 and ZrB2 at 1230 °C. Cold processing and sintering produced relatively dense TiB2–ZrB2 composites wherein ZrB2 was dispersed in the TiB2 matrix.

中文翻译：

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机械合金化辅助制备 TiB 2 –ZrB 2 复合材料

摘要 通过在行星式球磨机（Zr:Ti:B 摩尔比 = 1:1:4；球-与粉末的重量比 = 20:1）。使用 ZrO2 小瓶和球在氩气气氛中以 500 rpm 的速度进行研磨，然后在 1230 °C 下进行无压烧结。通过 X 射线衍射研究球磨时间对 MA 诱导相变的影响，并通过场发射扫描电子显微镜和透射电子显微镜监测粉末混合物和 TiB2-ZrB2 复合材料的微观结构发展。MA 降低了上述粉末混合物转化的活化能，使其在 1230 °C 下完全转化为 TiB2 和 ZrB2。