With the increasing demand for highly integrated circuits to optimize energy efficiency, reduce weight, and improve mechanical properties, finding a Magnesium (Mg) matrix material with excellent mechanical strength and high thermal conductivity poses a significant challenge. In this work, titanium (Ti) particles were introduced into AZ91 (Mg-9Al-1Zn) alloy to fabricate Ti/AZ91 composites, employing a combination of stir casting, extrusion and rolling processes. This strategy simultaneously enhances the mechanical properties and thermal conductivity of the Ti/AZ91 composites compared with AZ91 alloy. The incorporation of Ti particles serves to refine grains, expediting the formation of MgAl phase within the Mg matrix. Optimal comprehensive mechanical properties are attained in 10 wt% Ti/AZ91 composite, exhibiting an ultimate tensile strength of 365 MPa, an elongation of 11.9 %, and a significantly low wear rate of 4.548×10 mm/m. Notably, the 10 wt% Ti/AZ91 composite shows a 41.1 % reduction in wear rate relative to the AZ91 alloy, attributed to the incorporation of hard Ti particles. Furthermore, the thermal conductivity of the 2.5 wt% Ti/AZ91 composite exhibits a significant enhancement over that of the AZ91 alloy. Detailed discussions are provided on the fundamental mechanisms responsible for strengthening, wear resistance, and thermally conductive in Ti/AZ91 composites. These results highlight the substantial potential of Ti/AZ91 composites for lightweight structural applications, such as highly integrated circuits requiring excellent mechanical properties and high thermal conductivity.

中文翻译：

---

通过集成挤压和轧制连续变形加工提高Ti/AZ91复合材料的力学性能和导热性


随着对高度集成电路优化能源效率、减轻重量和提高机械性能的需求不断增加，寻找具有优异机械强度和高导热率的镁（Mg）基体材料提出了重大挑战。在这项工作中，将钛（Ti）颗粒引入到AZ91（Mg-9Al-1Zn）合金中，采用搅拌铸造、挤压和轧制工艺相结合的方式制备了Ti/AZ91复合材料。与AZ91合金相比，该策略同时增强了Ti/AZ91复合材料的机械性能和导热性。 Ti 颗粒的加入可以细化晶粒，加速 Mg 基体中 MgAl 相的形成。 10wt% Ti/AZ91复合材料获得了最佳的综合力学性能，其极限拉伸强度为365MPa，伸长率为11.9%，磨损率极低，为4.548×10 mm/m。值得注意的是，由于硬质 Ti 颗粒的加入，10wt% Ti/AZ91 复合材料的磨损率相对于 AZ91 合金降低了 41.1%。此外，2.5wt% Ti/AZ91 复合材料的导热率比 AZ91 合金显着增强。详细讨论了 Ti/AZ91 复合材料的强化、耐磨性和导热性的基本机制。这些结果凸显了 Ti/AZ91 复合材料在轻质结构应用中的巨大潜力，例如需要优异机械性能和高导热性的高度集成电路。