(1. 陜西理工大學(xué) 材料科學(xué)與工程學(xué)院，漢中 723000；
2. 陜西理工大學(xué) 礦渣綜合利用環(huán)保技術(shù)國家地方聯(lián)合工程實驗室，漢中 723000)
摘 要: 以通孔式結(jié)構(gòu)TC4鈦合金箔為增韌層，以TiC-Ti-Al混合粉末為反應(yīng)體系，采用放電等離子燒結(jié)技術(shù)(SPS)制備TC4/Ti2AlC-TiAl基疊層結(jié)構(gòu)復(fù)合板材。借助XRD、SEM等分析相組成和組織結(jié)構(gòu)，并測量室溫彎曲強(qiáng)度和斷裂韌性。結(jié)果表明，疊層結(jié)構(gòu)復(fù)合板材的力學(xué)性能呈各向異性；當(dāng)Ti2AlC含量(質(zhì)量分?jǐn)?shù))為15%時，斷裂韌性在加載方向垂直于疊層方向時達(dá)到最大值18.81 MPa·m1/2，遠(yuǎn)高于無Ti2AlC的復(fù)合板材的斷裂韌性。通孔疊層結(jié)構(gòu)設(shè)計以及復(fù)合化手段構(gòu)建了復(fù)雜的裂紋擴(kuò)展路徑，且鈦合金韌化層可以吸收斷裂能，對改善韌性具有重要作用，為金屬復(fù)合板材研究提供了一種全新的設(shè)計思路。
關(guān)鍵字: 疊層復(fù)合板材；金屬間化合物；結(jié)構(gòu)設(shè)計；力學(xué)性能
（1. School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong 723000, China;
2. National and Local Joint Engineering Laboratory for Slag Comprehensive Utilization and Environmental Technology, Shaanxi University of Technology, Hanzhong 723000, China）
Abstract:The TC4/Ti2AlC-TiAl based laminated composite sheets were prepared by the discharge plasma sintering technique (SPS), using TiC-Ti-Al system mixed powders as the reaction system and TC4 titanium alloy sheets with through-holes as the toughening layers. The phase composition and microstructure were analyzed by XRD and SEM, and the room temperature flexural strength and fracture toughness were also measured. The results indicate that the mechanical properties of the laminated composite sheets have anisotropy. When the content (mass fraction) of Ti2AlC is 15%, the fracture toughness reaches a maximum value of 18.81 MPa·m1/2 and it is much higher than that of the composite sheet without Ti2AlC, while the loading direction is perpendicular to the laminated structure. The through-hole laminated structure design and particle composite technology construct the complex crack propagation paths. Moreover, the titanium alloy toughening layers can absorb fracture energy, which play an important role in improving the toughness. Such design provides a new design idea for metal-based composite sheets.
Key words: laminated composite sheet; intermetallic compound; structural design; mechanical properties
