Title of article :
Study on the reaction mechanism and mechanical properties of aluminum matrix composites fabricated in an Al–ZrO2–B system
Author/Authors :
Heguo Zhu، نويسنده , , Yanqun Yao، نويسنده , , Jianliang Li، نويسنده , , Shi Chen، نويسنده , , Jun Zhao، نويسنده , , Hengzhi Wang، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2011
Pages :
6
From page :
179
To page :
184
Abstract :
The in situ composites with reinforcement volume fraction of 30 vol.% were fabricated by chemical synthesis method in an Al–ZrO2–B system. The reaction mechanism and mechanical properties of the composites were studied. When the B/ZrO2 mole ratio was zero, the reinforcements of the composite consisted of α-Al2O3 particles and Al3Zr blocks, whose volume fractions were around 8.74 vol.% and 21.6 vol.%. The ultimate tensile strength, elongation and elastic modulus of the composite at room temperature were 215.2 MPa, 3.0% and 110.6 GPa, respectively. With the increase of B/ZrO2 mole ratios, the ZrB2 particles were formed and the amount of the Al3Zr blocks decreased. When the B/ZrO2 mole ratio reached 2, the Al3Zr blocks almost disappeared and the reinforcements of the composite were composed of α-Al2O3 and ZrB2 particles, whose volume fractions were around 14.5 vol.% and 15.5 vol.%. As a result, the ultimate tensile strength and elongation of the composite increased to 245.4 MPa and 12.3%. However, its elastic modulus decreased to 100.4 GPa. The tensile fracture was governed strongly by the amount of Al3Zr in the composites. When the B/ZrO2 mole ratio increased from 0 to 2, the tensile fracture mechanism of the composites transformed from quasi-cleavage to toughness fracture.
Keywords :
C. Differential scanning calorimetry (DSC) , C. Electron microscopy (SEM) , B. Chemical synthesis , D. Mechanical properties , A. composite materials
Journal title :
Materials Chemistry and Physics
Serial Year :
2011
Journal title :
Materials Chemistry and Physics
Record number :
1063101
Link To Document :
بازگشت