Novel material search. High fatigue resistance, deformable

[MadEngineer00]

I am searching for a novel material. The material must bend and deform similarly to a ductile metal (picture bending a rod of lead or copper)The material must retain the new shape after deformation until such a time as it is re-positioned by bending into a new shape. This material has to be able to withstand at least 5 million bending cycles before suffering fatigue failure. A certain small percentage of elastic spring back is acceptable (< aprox 8%) as is a slight degradation of physical properties over the 5 million cycle life span of the material

any suggestions would be greatly appreciates

 

[cloa]

As you haven't specified any physical strength or stickness- I'll assume very low then pure iron will have fantastic fatigue properties and be very ductile. Any deformation creating plastic deformation will most like cause failure without even fatigue unless there is special effects like shape memory alloys but they take heat to fix.

 

[btrueblood]

What kind of temperature do you expect the thing to see?

There are materials like silly putty that have unlimited malleability (at low strain rates), but these also tend to cold flow/creep, like silly putty.

At the other end of the spectrum are pure metals like iron. There, find the most ductile/malleable metal. Lead is not a bad choice. Gold is better. Indium might work, given its low melting point and possible near-room temperature annealing.

 

[MadEngineer00]

The operating temperature would be in the 40F to 110f range. although, it is most likely to be used in room temperature conditions.

Creep and cold flow are not too much of a concern

The material does need to exhibit resistance to being deformed.

Angle of deformation should be 90 degrees, but the bend radius can be 3-5 inches