(中國科學(xué)院 金屬研究所, 沈陽 110016)
摘 要: 用擠壓鑄造法制備了不同結(jié)構(gòu)的SiC泡沫增強ZL109雙連續(xù)相復(fù)合材料, 研究了增強體骨架結(jié)構(gòu)（筋的結(jié)構(gòu)、 泡沫孔和體積分?jǐn)?shù)）對復(fù)合材料壓縮性能和彎曲性能的影響。結(jié)果表明： SiC泡沫增強體的筋的結(jié)構(gòu)影響了界面的結(jié)合, 影響了材料的壓縮性能；當(dāng)筋具有三明治結(jié)構(gòu)時, 復(fù)合材料的強度最大； 當(dāng)筋具有雙層結(jié)構(gòu)時, 復(fù)合材料的強度最低；隨著SiC泡沫孔徑的增大, 復(fù)合材料的壓縮強度、 彈性模量和屈服強度都有所提高, 材料的屈服應(yīng)變減小, 彎曲強度先升高后降低, 彎曲強度在泡沫孔徑為1.5 mm時達到最大值； 復(fù)合材料的壓縮強度隨著增強體體積分?jǐn)?shù)的增大而提高, 屈服應(yīng)變隨著體積分?jǐn)?shù)的增大而減小。
關(guān)鍵字: 雙連續(xù)相復(fù)合材料； 骨架結(jié)構(gòu)； 壓縮性能； 彎曲強度
TIAN Chong, HU Wan-ping, ZHANG Jin-song
（Institute of Metal Research, Chinese Academy of Sciences,
Shenyang 110016, China）
Abstract: The SiC/Al co-continuous composites reinforced by different structure SiC foam were fabricated, and the effects of preform structure on the mechanical properties were investigated. The results show that the structures of SiC foam strut play an important role to the compressive property of composites for changing the interface bond. The compressive strength of the composite reinforced by SiC foam with sandwich-structure strut is the highest, and that of the composite reinforced by SiC foam with double-layer strut is the lowest. With the increase of SiC foam aperture, the compressive strength, elastic modul and yield strength of the composites increase, but the ratio of compress decreases. The flexural strength gets the peak value when the aperture is 1.5 mm.With the increase of the volume fraction of SiC foam reinforcement, the compressive strength increases, but the ratio of compress decreases.
Key words: co-continuous composites; preform structure; compressive properties; flexural strength
