Please explain these two pages in your own words. Keep it verysmall.

Aluminum-Tin alloy 8xx.x • Aluminum-tin alloys that contain about 6% Sn are used for cast bearings because of the excellent lubricity imparted by tin. These tin containing alloys were developed for bearing applications • Bearings of aluminum-tin alloys are superior overall to bearings made using most other materials. Bearing performance of Al-Sn alloys is strongly affected by casting method. • Fine interdendritic distribution of tin, which is necessary for optimum bearing properties, requires small interdendritic spacing, and small spacing is obtained only with casting methods in which cooling is rapid.
Aluminum-Tin alloy 8xx.x From a foundry standpoint, the aluminum-tin alloy system is unique. • In the mold, the solidification starts at about 650 °C (1200 °F), and the tin constituents of the alloy are liquid until 229 °C (444 °F). • This extremely large solidification range presents unique problems. Rapid solidification rates are recommended to avoid excessive macro segregation It is use in bi-metal slide bearings for internal combustion engine.