Dont drive car when metal to metal sounds are happening! Need more details like was car overheating was serpentine belt still in tact etc radiator and alternator repairs are signs your car has high mileage so make sure all bolts were tightened and all fluids are topped off like coolant engine oil and transmission fluid. Tow car home or to shop if possible then try to start the vehicle if it starts let it idle and look and listen for source of the loud sounds you heard and trouble shoot each symptom.