الفهرس | Only 14 pages are availabe for public view |
Abstract The objective of this work was topresents experimental results and theoretical considerations to evaluate the effect of Lead and Tin additions on the solidification behavior of Al-Pb monotectic alloys used as self-lubricating bearings and as bush materials. To verify this aim we do the following:- Melt spinning technique was used to prepare ribbons. Therefore alloys were divided into two groups: The first group: monotectic alloy compositions Al-0.9 wt % Pb - Al-1.2wt % Pb - Al-5 wt % Pb - Al- 10wt % Pb- Al-20wt % Pb- Al-30wt % Pb - Al-50wt % Pb. The second group: To evaluate the effect of Tin,two alloys compositions were made (Al- 10 wt % Pb- Al-20 wt % Pb). Experimental techniques and devices used in this these study are ( x-ray diffraction, double bridge method, Dynamic resonance method and Vickers micro-hardness tester) to study Structural modifications, electrical, thermal and mechanical properties improvements on chill-block melt spinning of melt-quenched ribbons of the Al-Pb monotectic containing Tin are described and discussed. from our work it’s concluded that:- We can concluded that Al-10 wt % Pb and Al-10 wt % Pb-10 wt % Sn melt spun alloy has best physical properties , such as high values of conductivity , hardness , elastic modulus and internal friction. Key words: Melt-spin technique, X-ray diffraction, Lattice distortions, Resistivity, Elastic moduli, specific heat, and internal friction. |