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In practical factory terms, what we call "aluminum" usually refers to pure aluminum, while "aluminum alloy" means hardened aluminum with added alloying elements. Pure aluminum can actually be seen as a special case within the aluminum material category.
Pure Aluminum
It is a pure metal with an aluminum content of ≥99.0%. Common grades like 1050 and 1060 have a purity of up to 99.5% and 99.6% respectively.
It only contains trace impurities such as iron and silicon, with no intentionally added alloying elements. Its crystal structure is uniform, essentially a single metal element.
Aluminum Alloy
Typical examples include 6061 (Al-Mg-Si alloy), 5052 (Al-Mg alloy), and 2024 (Al-Cu alloy).
It is an alloy material based on aluminum as the matrix, with active addition of alloying elements like magnesium, silicon, copper, zinc, and manganese.
Different proportions of alloying elements form various series of aluminum alloys. For instance, the alloying elements will form strengthening phases (e.g., Mg₂Si), which drastically alter the mechanical properties of pure aluminum.
Performance Comparison
| Performance Metrics | Pure Aluminum (e.g., 1060) | Aluminum Alloy (e.g., 6061 T6) |
|---|---|---|
| Strength & Hardness | Extremely low; soft and easily deformable | Significantly higher; suitable for load-bearing applications |
| Heat Treatment Hardenability | Not heat-treatable; only work-hardenable via cold processing | Certain series (e.g., 2xxx, 6xxx) are heat-treatable (T6 temper available) |
| Electrical & Thermal Conductivity | Excellent; close to the theoretical value of pure aluminum | Decreases with increasing alloying element content; more elements mean poorer conductivity |
| Corrosion Resistance | Excellent; dense oxide film easily forms on the surface | Varies by composition; pure aluminum generally has better corrosion resistance than high-strength aluminum alloys |
| Formability & Processability | Excellent; easy for deep drawing and bending | Decreases as strength increases; difficult to form in high-strength tempers (e.g., T6) |
Core Differences Summary
Pure Aluminum
Simple processing technology, good plasticity, easy to stamp, draw and weld, with low cost.
Insufficient strength, making it unsuitable for structural components.
Aluminum Alloy
Processing difficulty varies by series. For example, 6061 has excellent machinability and is ideal for CNC machining; high-strength aluminum alloys require special welding processes, with higher costs than pure aluminum.
Performance can be adjusted through heat treatment and cold processing, resulting in a wider range of applications.
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