Mechanical properties of monolithic AIN and SiCw/AIN composites

Autor:	C. K. Unni, D. E. Gordon
Rok vydání:	1995
Předmět:	Materials science Aluminium nitride Mechanical Engineering Whiskers food and beverages Strain rate Fatigue limit chemistry.chemical_compound Flexural strength chemistry Mechanics of Materials Whisker Ultimate tensile strength General Materials Science Composite material Tensile testing
Zdroj:	Journal of Materials Science. 30:1173-1179
ISSN:	1573-4803 0022-2461
DOI:	10.1007/bf00356116
Popis:	Flexural, tensile, and high cycle fatigue test data are presented for pressureless sintered aluminium nitride (AIN) and hot-pressed aluminium nitride reinforced with silicon carbide whiskers (SiCw/AIN). Tests were conducted at ambient temperature. The SiCw/AIN composites consisting of 30wt% SiCw produced significant increases in flexural strength, tensile strength, and tensile fatigue strength compared to monolithic AIN. Increases were nearly double in all cases. Corresponding strain-to-failures measured in tensile tests increased from ∼ 0.04% in monolithic AIN to ∼ 0.10% in the SiCw reinforced composite. Fracture surfaces showed evidence of whisker-toughening mechanisms due to additions of SiCw whiskers. High-cycle fatigue results indicated that both materials have the ability to sustain higher stress levels in the cyclic tests compared to the tensile experiments. The improved performance under cyclic testing is explained in terms of strain-rate effects. The times at or near peak stress are considerably less under high-cycle fatigue testing (20 Hz) compared to tensile tests (strain rate = 0.5%min−1).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1b206880f00a27b82f804e646150b2ca https://doi.org/10.1007/bf00356116 Zobrazit plný text záznamu Full text from SpringerLink