ABSTRACT In this study, the nanophase ZrCr2 intermetallic compound was produced by the mechanical alloying (MA) and subsequent heat treatment. The phase transformations, crystallite size, lattice strain, and stored energy were studied at different milling times. The results indicated that MA caused to form a nanocomposite of the Cr(Zr) and Zr(Cr) supersaturated solid solutions. After 32 h of milling, the stored energy of Cr-reach phase in the powder mixtures reached to about 7.407 kJ/mol. Also, the 32 h milled powders were heated up to 750°C by the differential thermal analysis in argon atmosphere which the XRD results of the heated powders revealed that the nanostructure ZrCr2 intermetallic compound was formed in the Zr and Cr matrix. Indeed, MA reduced the formation temperature of the ZrCr2 intermetallic phase from 1673 °C to 608 °C which confirmed that MA and subsequent heating is a proper technique at low temperatures. In addition, a kinetics analysis implied that the Johnson-Mehl-Avrami (JMA) model can explain the kinetics formation of ZrCr2 phase during the heat treatment which confirmed that the dominant mechanism of the intermetallic phase formation was the process controlled by the volume diffusion phenomenon, so that the nuclei grow in three dimensions of space.

中文翻译：

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通过 MA 工艺和后续热处理生产纳米结构 Zr-ZrCr2-Cr 复合材料

摘要 在这项研究中，纳米相 ZrCr2 金属间化合物是通过机械合金化 (MA) 和随后的热处理生产的。研究了不同研磨时间下的相变、微晶尺寸、晶格应变和储存能量。结果表明MA导致形成Cr(Zr)和Zr(Cr)过饱和固溶体的纳米复合材料。研磨 32 小时后，粉末混合物中 Cr-reach 相的储存能量达到约 7.407 kJ/mol。此外，在氩气气氛中通过差热分析将 32 小时研磨的粉末加热至 750°C，加热粉末的 XRD 结果表明，在 Zr 和 Cr 基体中形成了纳米结构的 ZrCr2 金属间化合物。确实，MA 将 ZrCr2 金属间相的形成温度从 1673 °C 降低到 608 °C，这证实了 MA 和随后的加热是低温下的适当技术。此外，动力学分析表明 Johnson-Mehl-Avrami (JMA) 模型可以解释热处理过程中 ZrCr2 相的形成动力学，证实金属间相形成的主要机制是体积扩散现象控制的过程，使原子核在空间的三个维度上生长。