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the mechanical properties of both alumina-poor and alumina-rich xal2o3(100-x)sio2 glasses were investigated. all glasses showed brittle behavior. the fracture strength increased monotonically with increasing alumina content from x=10 to x=40 and then decreased again as the al2o3 content increased further. in contrast to the fracture strength, the fracture toughness values of all glasses remained almost constant at around 2.5mpa·m1/2. this indicates that the fracture toughness of alumina-rich al2o3sio2 glasses is higher than that of alumina-poor al2o3sio2 glasses and is not dependent on the alumina content. the fracture toughness of the alumina-rich al2o3sio2 glass is comparable to that of the high alumina containing xal2o3(100-x)sio2 glasses and is higher than that of the alumina-poor al2o3sio2 glasses. the fracture toughness is higher than the yield strength of the al2o3sio2 glasses as expected. the improved toughness of al2o3sio2 glasses is likely to be the combined effect of two different mechanisms: the first is the new yield mechanism that is activated in the al2o3sio2 glasses, and the second is the crack bridging mechanism that is activated in the conventional silicate glasses. the cracking resistance of binary aluminosilicate glasses is improved due to the increase in the free volume by the alumina addition. the novel fracture toughness mechanism of the aluminosilicate glasses may be explained by the increase in the free volume in the aluminosilicate glasses. the void space in the aluminosilicate glasses can be filled by the formation of an al2o3 network that makes the network more resistant to the mechanical stresses. moreover, the al2o3al2o3..sio2 network in the aluminosilicate glasses can act as a buffer by absorbing the mechanical stress. in addition, the formation of the al2o3 network may reduce the thermal expansion coefficient and lower the coefficient of thermal expansion and thermal conductivity of the aluminosilicate glasses. the lowering of the coefficient of thermal expansion and thermal conductivity and the increase in the free volume in the aluminosilicate glasses can improve their thermal shock resistance. 84d34552a1