The Bendgate issue was one of the most trending topic when the iPhone 6 and 6 Plus were released. After a series of parody, Apple decided to change the material used in the construction of the phone body. The next iPhone could be using aluminium alloy which is currently used in the Apple Watch sports edition.
This aluminium alloy is the ideal material for next iPhone with 60% more stronger and durable. With lower density, it is expected to be more lightweight and does not leave any scratch sign. Expected to be implemented in the next iPhone, this material is likely enhance the durability as well as the design of the phone.