Differences from Other Copper Alloys
Uses and Application Fields
> CFA > Characteristics > Mechanical Characteristics
Mechanical Characteristics
Mechanical Characteristics Physical Characteristics

Tensile Property
      The following graph shows the changes of Tensile Strength and Elongation according to
      Cu content in hot rolled materials. Compared to pure metal, CFA shows higher tensile
      strength according to the increase of Cu content, and lower elongation, and in the test
      range, tensile strength is getting lower almost in a straight line, and the elongation is
      increased but with small changes.

Work Hardening Property
      The following graph shows the changes of Tensile Strength and Elongation by cold
      drawing It’s easy for cold working, and by wire drawing more than 80% of Area Reduction
      Rate is possible. By cold drawing the elongation shows relatively gentle decline.
      As seen on the figures on the right, not only in cold drawing but also in general metal
      forming, the state of Fe forms fiber structure elongated to the drawing direction, and
      even with annealing this structure will not change.

Eduction Hardening Property
      The following graph shows Hardness changes in heating of CFA 50 ; one with solution treatment
      and the other with cold working. s seen from solution treated material, eduction hardening occurs
      -around 300℃(572℉), and heating with around 500℃(932℉) shows about Hv35 of hardening.
      In case of cold worked material, heating causes softening, but when heated with around 300℃~600℃
      (572℉~1,112℉) softening slows down under the influence of induction hardening.
      This hardening is regarded as the age hardening phenomenon by eduction of Cu from Fe or eduction
      of Fe from Cu, and this phenomenon is also identically verified with CFA with different Cu content.
      It is also found that CFA is most softened with 800℃~850℃(1,472℉~1,481℉) of heat treatment.
      And solution treated needs to be heated over modification temperature of 835℃(1,535℉)(about 875℃
      (1,607℉) when heated) and to be rapidly cooled.

Strength and Elongation
      The following graph shows relation between Tensile Strength and Elongation of various CFA.
      Compared on the same level of strength, age-hardened material has higher elongation.
      Also verified is that in order to get higher strength with cold-worked material, the lower
      Cu content, the higher elongation it gets.
      Likewise, compared with soft and 3 hard materials of PBW (Phosphor Bronze Wire 3), CFA alloy
      in soft state shows lower elongation than PBW3, ;but in hard state it shows higher elongation.

Wear Resistance
      The following graph shows sliding wear test of CFA 50 and its relative Pure Copper, and their
      relations with hardness. Hardness of CFA 50 was adjusted by heat treatment or cold working.
      As for abrasion loss of test specimen, it shows a tendency that harder material has decreased
      abrasion. For comparison, test with PBW3-O & -H was made but it shows 10 times, more abra-
      sion loss than CFA 50 Abrasion loss of Relative material Cu(Hv88) is much more than, the test
      specimen it shows a tendency that harder material has decreased abrasion.
      In case of CFA 50 and its relative material Cu, and in case of PBW and its relative material Cu,
      there has been little difference of abrasion loss.

Hot Temperature Hardening
      The following graph shows relations of temperature and hardness of CFA 50 in solution treated
      state and age treated state. Solution treated material shows hardness increase due to eduction
      hardening over 300℃(572℉). Age treated material has higher hardness at room temperature and
      occurs hardening at slightly lower temperature than solution treated material.
      Age treated CFA 50 maintains higher than the relative material Cu-Cr alloy up to 600℃.(1,112℉).