金屬基複合材料在材料應用中占主要部分。鎂是最輕的結構金屬之一，在輕質材料應用中，鎂基具有很高的強度，可以保持能量和質量。在這項工作中，使用攪拌鑄造法加入0, 0.3, 0.6, 1.0 wt％的WS2微粒，強化AZ91金屬基複合材料特性。將複合材料於410℃中均質化24小時。且將均質化後的1.0 wt％的WS2/AZ91複合材料退火10小時，然後水裡進行淬火2秒。使用等通道轉角擠壓（Equal Channel Angular Pressing , ECAP）使得試片變形。使用配置有能量色散光譜儀（EDS）的掃描電子顯微鏡（SEM），觀察了添加WS2而引起的微觀結構變化現象，於熱處理會造成劇烈的塑性變化。相組合之探討使用X射線衍射（XRD）進行觀察。並使用維氏硬度計研究微硬度，MTS-100測試系統研究了機械強化性能。應力-應變曲線和速率變化使用應變分析儀並結合 XRD定性顯微組織數據分析了複合材料，證實線性曲線確認通過數次檢測與機械強度之間關係。
研究證明，添加強化項之材料會降低孔隙率，而且會增強複合材料的強度和硬度。均質化後的0.3wt％WS2 / AZ91複合材料經歷Pop-in特性，這是由於pop-in塑性變形引起的。鑄錠凝固過程中形成的沉澱物發生形變之後轉變為狹窄狀並會集中在晶界處。 在劇烈的塑性變形期間產生之相組成，同時促進了複合材料的彈性模量的變化。材料均質化後，複合材料只能成功進行兩次ECAP擠製。 機械性能與退火後的WS2/AZ91複合材料成線性比例。材料斷裂的表面顯示，隨著濃度的增加，斷裂的機制會從彈性變形轉移至塑性變形。經過兩次ECAP擠製後，產生嚴重塑性變形，空隙完全消失。ECAP經四次擠製後，退火後的1wt％WS2 / AZ91複合材料具有最大的強度和硬度。

Metal matrix composites contribute a significant part in materials applications. Magnesium is one of the lightest structural metals, has strong intension in lightweight applications to preserve energy and mass. In this work, WS2(0, 0.3, 0.6,1) wt% microparticles reinforced AZ91 metal matrix composites were fabricated using the stir casting method. The composites were homogenized at 410°C for 24 h. The 1wt%WS2/AZ91 was annealed for 10hs After homogenization and quenching in-plane water for 2s. The samples were deformed using equal channel angular pressing(ECAP). The microstructural changes due to heat treatment, severe plastic changes, and WS2 addition were investigated using a scanning electron microscope(SEM) equipped with an energy dispersive spectroscope(EDS). The phase composition was investigated using x-ray diffraction(XRD). The microhardness was investigated using Vickers’s hardness apparatus, and mechanical enhancement was studied using MTS-100 testing systems. The strain hardening rate was analyzed using the stress-strain curve, and the qualitative microstructure was analyzed using XRD data. The linear curve fitting has been used to estimate the relation between the number of passes and mechanical strengthening.
The results indicate that the addition of reinforcement reduces the porosity and enhances the strength and hardness of the composites. The homogenized 0.3wt%WS2/AZ91 experience pop-in behavior, which is due to elastic-plastic deformation. The precipitates formed during solidification of cast ingots are transformed into straits after deformation and concentrated at grain boundaries. The constituent phases produced during severe plastic deformation encourage the variation in elastic modulus of the composites. After homogenization, composites are only succeeded for two passes of ECAP. Mechanical properties are linearly proportional to annealed WS2/AZ91 composites. The fractured surfaces indicate that as concentration is increased, the fractured mechanism is transferred from elastic to plastic. The voids have completely vanished after two passes of severe plastic deformation by ECAP. The annealed 1wt%WS2/AZ91, after four passes of ECAP, exhibits the maximum strength and hardness.

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