(1. 中國科學(xué)院 金屬研究所， 沈陽 110015；
2. 中國科學(xué)院 金屬研究所材料疲勞與斷裂國家重點(diǎn)實(shí)驗(yàn)室，沈陽 110015)
摘 要: 研究了粉末冶金法制備的SiC顆粒增強(qiáng)鋁基復(fù)合材料薄板的常溫及高溫力學(xué)性能。結(jié)果表明，鋁基復(fù)合材料薄板在常溫下具有較高的強(qiáng)度，薄板性能基本呈各向同性，其斷裂機(jī)制主要為顆粒從基體脫粘，同時(shí)有少量顆粒破碎。隨著溫度的升高，復(fù)合材料板材強(qiáng)度逐漸下降，延伸率增大。在200 ℃時(shí)仍能保持較高的強(qiáng)度和較好的綜合性能，其抗拉強(qiáng)度達(dá)370MPa，屈服強(qiáng)度達(dá)243 MPa，延伸率達(dá)11.3%。
關(guān)鍵字: 鋁基復(fù)合材料； SiC顆粒； 力學(xué)性能； 斷裂機(jī)制
（1. Institute of Metal Research， The Chinese Academy of Sciences，Shenyang 110015， P.R.China；
2. State Key Laboratory for Fatigue and Fracture of Materials， Institute of Metal Research， The Chinese Academy of Sciences， Shenyang 110015， P.R.China）
Abstract:The mechanical properties of SiC particulatereinforced aluminum matrix composite sheets via P/M technique at ambient and elevated temperatures were investigated. The results show that the rolled sheets have an elevated ultimate tensile strength and appear isotropic at ambient temperature. The particles separating from the matrix is the main failure mechanism of these materials， as well as some fractured particles are observed. It is also found that the strength of these materials decreases and the ductility increases with increasing temperature. Up to 200 ℃， the materials still have quite higher strength and show preferable properties. The ultimate tensile strength reaches about 370 MPa， and the yield strengtreaches 243 MPa， as well as the ductility reaches 11.3%.
Key words: aluminum matrix composites; SiC particulate; mechanical properties; failure mechanism
