Titanium is significantly stronger than both aluminum and magnesium, although its higher density means that strength-to-weight ratios for the three metals tend to be similar. It is often the first port of call for engineers looking to replace steel in a light weighting exercise for stressed components. It has the additional advantage of being highly corrosion-resistant and also has very high biocompatibility.
Unfortunately, the high cost of extraction and fabrication may rule out its use for the general consumer market.
In industry, titanium can be found:
On ship hulls, submarines, and other structures exposed to seawater, due to its high corrosion-resistance
In hip replacements and dental implants, due to its high biocompatibility and strength.
In aircraft, spacecraft, and missiles.
If money is no issue, titanium is an excellent choice for a strong, lightweight material. Thanks to developments in coating technologies and newly researched alloys, cost-effective magnesium is increasingly emerging as the lightest solution. These three metals are often being considered concurrently in light weighting exercises, along with composite materials and even high strength steels.
One other consideration that is often overlooked is the question of stiffness. Creating a steel or light alloy (e.g. aluminum) component of similar strength will, in many cases, require the use of higher wall thicknesses for the aluminum component compared to the steel component. One positive consequence of this at the aluminum component may actually be stiffer than its steel counterpart. This is noticeable in automotive body panels for example, where an aluminum monocoque body can be stiffer than its steel counterpart. This is noticeable in automotive body panels for example, where an aluminum monocoque body can be stiffer than a steel body for this reason. In this case, there is a benefit in vehicle handling, for example, and also crash resistance.