Magnesium, Titanium
The most common metal used for standard bicycle frames is steel, although it is possible to get frames made from graphite, aluminum, and titanium alloy.
Frames that can bend and not break as easily
No
Motobecane frames are made by Kinesis in Taiwan. Kinesis also makes the bicycle frames for Jamis, Specialized, Schwinn, Felt, and other well known bicycle brands.
Oh sure. Carbon fiber frames are composites, and quite popular.
Magnesium, particularly in an aluminum-magnesium alloy makes for light, stiff frames.
These days - usually not.
Both 6000- and 7000-series alloys can be used for bike frames.
There is no bicycle that is made out of Nickel. Some steel frames may be coated with Nickel only for aesthetic purposes.
Wall thickness is about one mm.
For bike frames titanium can be used unalloyed.
Looking to purchase a bicycle frame without the accessories? Not all bicycle frames are made the same, therefore a low-quality bicycle frame can be purchased used for as low as 99 cents on ebay, while better quality frames may cost a few hundred dollars.