Is it a good idea to purchase a pressure cooker made of aluminum?!
That really depends. What gauge aluminum? Is it 100% aluminum. Aluminum is a weaker metal, but it is a great conductor, which is why it is used in so many pots and pans. Typically if there is a lot of aluminum in a pan, it is a cheaper product. I wouldn't want to waste money on a cheap pressure cooker--too dangerous. I'd go ahead and look for steal. Pressure cookers are an investment; may as well make it worth it.