Magnesium Alloy AZ91E and its Usage in Bicycle Frame Design

From the measured fatigue-affected Young’s modulus the damping curves and the damping
model the following conclusions could be drawn.
1. Increasing number of cycles to fatigue increases the maximum and shifts it to smaller
Conclusion:-
strains. This is reasonable if one assumes that during cycling both, crack nucleation, and
crack growth take place and that the critical strain of a crack is monotonously decreasing
with crack length l, e.g. like a demand of crack growth theory. Therefore, the magnesium
AZ91 alloy acts as a good substitute for steel which has been in current use.
The greatest advantage of choosing magnesium alloys for engineering designs is its low
density, which can contribute significantly to the aspect of weight savings in the design and
construction of bicycles. The AZ91E magnesium alloy, preformed with complete shape, has
been prepared using spray forming technology under a protective atmosphere. The
microstructure and mechanical properties have been investigated. The average tensile ultimate
and yield strength of the spray-formed and extruded AZ91 magnesium alloy samples were
435 MPa and 360 MPa with a room temperature elongation of 9.2%, indicating an enhanced
combination of toughness and strength. So, this is a good material choice for this operation.
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