Aluminium alloys have undergone a dramatic transformation in areas of extrusion, machining, welding, heat treatment, structural changes, created by ultra fine particles and enhanced corrosion resistance. Hence, these alloys have made rapid gains in European automotive and space industry. These developments have been described by experts in the book with new data and attractive graphics. The effect of processing parameters, including welding and deep rolling on their performance have been highlighted to alleviate the concerns of manufacturers and designers for new applications.
Aluminum alloys also display high fatigue crack growth rate, as much as three times
faster than in steel specimens when subjected to the same stress intensity (Czyryca et al
2006). Aluminum alloys are anodic to most other materials used in construction and
therefore, susceptible to localized galvanic corrosion. They are also sensitive to stress
corrosion cracking. Other concerns involve marine fouling since aluminum alloys
cannot be coated with conventional Cu-based antifouling coatings.
In summary, the U.S.
Aluminum is the second most plentiful element on the earth and it became a
competition in 19th century. The huge demand of aluminum is projected to get 70
million tons, over 30 millions being obtained from recycled scrap. The scope of
aluminum ranges from household to space vehicles.
Trong thực tế, đối với các đường dây truyền tải điện cao áp, người ta
thường sử dụng các loại dây dẫn như: dây nhôm lõi thép AC, dây nhôm lõi thép
tăng cường ACSR (aluminum conductor steel-reinforced), dây toàn nhôm AAC
(all aluminum conductor), dây toàn hợp kim nhôm AAAC (all aluminum alloy
conductor), và dây nhôm lõi hợp kim nhôm ACAR (aluminum conductor alloy
reinforced). Sở dĩ, các loại dây nhôm này được sử dụng phổ biến là vì...
Aluminum is the most abundant metal and the third most abundant chemical element in the earth's
crust, comprising over 8% of its weight. Only oxygen and silicon are more prevalent. Yet, until about
150 years ago aluminum in its metallic form was unknown to man.
There are three methods for hardening copper: grain-size control, cold working, or alloying. When
copper is hardened with tin, silicon, or aluminum, it generally is called bronze; when hardened with
zinc, it is called brass.