Titanium and its alloys have very high strength-to-weight ratios. The densities of titanium-based alloys range between 0.160 lb/in3 (4.43 gm/cm3) and 0.175 lb/in3 (4.85 gm/cm3). Yield strengths range from 25,000 psi (172 MPa) for commercially pure Grade 1 to greater than 200,000 psi (1380 MPa) for heat-treated beta alloys. By far the most important use of titanium is in making alloys. It is the element most commonly added to steel because it increases the strength and resistance to corrosion of steel. Titanium provides another desirable property to alloys: lightness. Its density is less than half that of steel, so a titanium-steel alloy weighs less than pure steel and is more durable and stronger. These properties make titanium-steel alloys particularly useful in spacecraft and aircraft applications, which account for about 65% of all titanium sold. These alloys are used in airframes and engines and in a host of other applications, including armored vehicles, armored vests and helmets; in jewelry and eyeglasses; in bicycles, golf clubs, and other sports equipment; in specialized dental implants; in power-generating plants and other types of factories; and in roofs, faces, columns, walls, ceilings and other parts of buildings. Titanium alloys have also become popular in body implants, such as artificial hips and knees, because they are light, strong, long-lasting, and compatible with body tissues and fluids.

Quote from wikipedia: Tungsten carbide, WC is an inorganic chemical compound containing equal parts of tungsten and carbon atoms. Colloquially, tungsten carbide is often simply called carbide. In its most basic form, it is a fine gray powder, but it can be pressed and formed into shapes for use in industrial machinery, tools, abrasives, as well as jewelry. Tungsten carbide is approximately four times stiffer than steel, with a Young's modulus of approximately 550 GPa,[1] and is much denser than steel or titanium. It is comparable with corundum (α-Al2O3) in hardness and can only be polished and finished with diamond wheels and compounds.