Journal Article

Al–TiO2–Gr powder metallurgy hybrid composites with cold upset forging

Ravichandran, M., Anandakrishnan, V., Naveen Sait, A.

2014

Overview

The cold upsetting studies were carried out for the aluminium metal matrix hybrid composites in the present study. Aluminium metal matrix hybrid composites were synthesised through powder metallurgy route from ball-milled powders to yield the following compositions：Al ＋ 2.5 wt% TiO2＋ 2 wt% Gr, Al ＋ 2.5 wt% TiO2＋ 4 wt% Gr, Al ＋ 5.0 wt% TiO2＋ 2 wt% Gr and Al ＋ 5.0 wt% TiO2＋ 4 wt% Gr. The compaction process was carried out using suitable punch and die in 40 k N hydraulic press, and sintering was done in an electric muffle furnace at the temperature of 590 °C for 3 h. The sintered preforms were subjected to incremental compressive loading of 10 k N until the cracks were found at the free surface. The true axial stress, true hoop stress, true hydrostatic stress and true effective stress were calculated for all the preforms, and all these stresses are correlated with the true axial strain. The stress ratio parameters（rz/reff, rh/reff, rz/rmand rh/rm） of the all preforms were correlated with true axial strain. The maximum true axial stress, true hoop stress, true effective stress and hydrostatic static stress are obtained for the composite containing5 wt% of TiO2 and 4 wt% of graphite and the minimum ones are obtained for composite containing 2.5 wt% of TiO2 and 2 wt% of graphite.

• Publisher: Nonferrous Metals Society of China,Springer Nature B.V
• Subject: Biomaterials / Chemistry and Materials Science / Cold upsetting / Energy / Materials Engineering / Materials Science / Metal matrix composites / Metallic Materials / Nanoscale Science and Technology / Physical Chemistry / Powder metallurgy / TiO2 / 冷顶锻 / 环向应力 / 石墨复合材料 / 粉末冶金 / 轴向应力 / 轴向应变 / 铝金属基复合材料