Flow mechanisms in creep of short fibre AZ91 alloy-based composite

A comparison between the creep characteristics of an AZ91 magnesium alloy reinforced with 20 vol.% Al2O3 short fibres and an unreinforced AZ91 matrix alloy shows that the creep resistance of the reinforced material is considerably improved compared to the matrix alloy. It is suggested that the creep strengthening in the composite arises mainly from the existence of a threshold stress and the load transfer effect. The values of the threshold stress in the creep of the composite at temperatures in the range from 373 to 673 K were estimated using standard methods. It is proposed that the threshold stress arises from an attractive interaction between mobile dislocations and Mg17(Al, Zn)12 precipitates

Microstructural processes in creep of an AZ 91 magnesium-based composite and its matrix alloy

Constant stress tensile creep tests were conducted on an AZ 91–20 vol.% Al2O3 short fiber composite and on an unreinforced AZ 91 matrix alloy. The creep resistance of the reinforced material is shown to be considerably improved compared with the matrix alloy. The creep strengthening arises mainly from the effective load transfer between plastic flow in the matrix and the fibers. Microstructural investigations by TEM revealed good fiber–matrix interface bonding during creep exposure. The microstructures of the AZ 91 alloy and its composite were similar with regard to two types of β-phase precipitates; the enhanced precipitation of the Mg17 (Al, Zn)12 phase on the fibers is promoted by heterogeneous nucleation due to the Al enrichment of the matrix near to the alumina fibers

Interpretation of creep of Cu-Zn alloy on the basis of a composite model of the dislocation structure

38.00; Translated from Czech. (Kovove Mater. 1989 v. 27(4) p. 415-439)Available from British Library Document Supply Centre- DSC:9023.19(VR-Trans--4409)T / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo

Creep behaviour of an aluminium alloy reinforced by silicon carbide particulates

Translated from Russian (Kovove Mater. no. 3S (1998) p. 57-61)Available from British Library Document Supply Centre-DSC:9023.190(9551)T / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo

Interpretation of creep of Cu-Zn alloy on the basis of a composite model of the dislocation structure

38.00; Translated from Czech. (Kovove Mater. 1989 v. 27(4) p. 415-439)Available from British Library Document Supply Centre- DSC:9023.19(VR-Trans--4409)T / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo