Titanium alloy and aluminum alloy, as two common metal materials, play important roles in industries, aviation, and other fields. However, they have significant differences in density, strength, melting point, corrosion resistance, processability, magnetism and conductivity, aesthetics, and plasticity, which determine their respective applicable scenarios.

1. Density and weight

The density of titanium alloy is 4.54g/cm ³, while the density of aluminum alloy is 2.7g/cm ³. Aluminum alloy has a wide range of applications in areas such as automobiles, bicycles, and airplanes that require weight reduction due to its lightweight properties. Although titanium alloy is heavier than aluminum alloy, its lightweight properties still make it an ideal choice for high-performance applications such as spacecraft and medical devices.

2. Strength and hardness

The strength and hardness of titanium alloy are superior to aluminum alloy, making it particularly suitable for components that require high strength and wear resistance, such as spacecraft and medical equipment. Although the strength of aluminum alloy is slightly inferior, it can still meet the needs of many daily and industrial applications.

3. Melting point and high temperature resistance

The melting point and high temperature resistance of titanium alloy are much higher than those of aluminum alloy, which can maintain stable performance at high temperatures. Therefore, it performs well in high-temperature environments such as rocket engines and jet engines. Although aluminum alloy can withstand certain high temperatures, its performance will significantly decrease at high temperatures.

4. Corrosion resistance and oxidation resistance

Titanium alloys have excellent corrosion resistance and oxidation resistance, and can resist the erosion of various chemical and electrochemical reactions, forming a dense passivation film. This gives titanium alloys unique advantages in environments such as seawater, saltwater, acidity, and alkalinity. Although aluminum alloy also has certain corrosion resistance and oxidation resistance, it is far inferior to titanium alloy in this regard.

5. Magnetism and conductivity

Titanium alloy is a non-magnetic material that is not affected by magnetic fields and does not generate magnetic fields. Its conductivity is relatively poor and its resistivity is high. This makes titanium alloys perform excellently in magnetic resonance imaging, maglev trains, and other applications that require high diamagnetism. Although aluminum alloy has certain conductivity, it is more suitable than titanium alloy for applications that require moderate diamagnetism and high conductivity, such as electronic devices, communication equipment, etc.

6. Aesthetics and plasticity

The appearance of titanium alloy is silver white, with a metallic luster and is not easily oxidized or discolored. It also has high plasticity and can be made into products of various shapes, sizes, and structures through various processing methods. This makes titanium alloy highly favored in jewelry, watches, glasses and other occasions that require high aesthetics and plasticity. Although aluminum alloy is slightly less aesthetically pleasing and malleable than titanium alloy, it still performs well in moderately demanding applications such as furniture, doors, windows, and lighting fixtures.

7. Process performance and processing performance

In terms of process and processing performance, aluminum alloy is superior to titanium alloy. Aluminum alloy has good plasticity, malleability, weldability, and machinability, low processing difficulty, and relatively low cost. The processing difficulty of titanium alloy is relatively high, requiring special equipment and tools, and the processing cost is also relatively high.

In summary, titanium alloys and aluminum alloys each have their unique properties and advantages, making them suitable for different application scenarios. When selecting metal materials, it is necessary to comprehensively consider specific performance requirements and cost-effectiveness. Whether it is titanium alloys that pursue high performance, high quality, and high added value, or aluminum alloys that pursue low cost, high efficiency, and high quality, they can all exert their unique value in different fields.