Titanium and titanium alloy (Ti, Ti Al - V) -
Al alloy (Al and Mg - - - - the Si Zn Cu (Mg) -
Long ago made of aluminum alloy frame is useful. Light and low price is its advantages. But from "light", current and iron materials are compared. Old driver react to it is "although light but flexible". Although after many improved, but always overcome young modulus of the low. Recently, in order to improve the aluminum alloy frame young modulus, pipe diameter, using flat tube, or aluminum heat pipe etc, create light and have rigid frame, the latest drivers for the aluminum alloy frame, it have enough light and rigidity.
Pure aluminum alloy is added, Zn, Mg, Cu etc of metal Si alloy. Aluminum itself is lightweight, plasticity, corrosion resistance, join other advantages, such as improved significantly after metal mechanical properties. Most of the aluminum alloy used bicycle for 60 (Si) Al - Mg - 70 (Al and Mg - - - Zn, Cu) two heat freated (aluminum, under high temperature resistant to change the properties of chian can be made).
6000 is considered corrosion resistance, good weldability, and good materials. The table below that use most 6061 mechanical strength.
7000 is the strongest aluminum alloy material. Especially a super-hard aluminum 7075 aircraft (materials), but it's difficult, corrosion resistance welding (white) will etc. The table below that use most 7005 and mechanical properties of alloys 7075). The table below numerals with heat:
- 0: totally annealing
- T5: artificial aging (no information processing),
- T6: processing information after artificial aging
- T7 has debtors: then stabilizing treatment
- T8: debtors, hardening processing, artificial aging
(the right picture) I DRIVE - XC team in the game when aluminum frame, lightweight about 2 million yuan price.
The mechanical characteristics of 6061 alloy
heat
Elongation intensity (MPa)
Endurance,
(MPa)
elongation
(%)
Shear strength (MPa)
Brinell hardness
Fatigue strength (MPa)
T5
190
148
12
119
60
67.
T6
246
218
12
155
73.
67.
T83
260
246
11
155
82,
-
Titanium and titanium alloy (Ti, Ti Al - V) -
For the first time in the 1960s to make use of titanium alloy bicycle frame. Titanium alloy gives the impression of a "light and hard." Early game, as the titanium alloy frame, the transport, rigid frame is not suitable for long distance race, also not applicable to all the games, only suitable for use in the mountains, or traial time-released reces Big, the specific needs of small. Some people start titanium, there have been devoted to lightweight rider, put all the screws are made of titanium alloy with only satisfied. Titanium to some people, expensive and rare, the illusion of titanium is actually on earth element of the rich geobiology. Just because of the high cost of production, alloy, price is more expensive.
Metal titanium proportion of light, strength, high resistance to corrosion materials, usually in a specific environment. Add in the metal aluminium vanadium, titanium, V (Li) intensity increased significantly, heat treatment and aluminum alloy as through the aging treatment can improve strength.
The mechanical properties of titanium alloy
Alloy name
distinguish
Tensile strength (MPa)
Endurance (MPa)
Elongation (%)
E (GPa)
Pure titanium,
JIS 3 kinds
480-62
345 -
18
105
Grade 4
550
480
15
PTT800
800
--
--
UTT75
750
--
--
3-2.5 Ti
annealing
685
590
20
--
6-4Ti
annealing
980
920,
14
110,
Aging treatment
1160
11
10
Adopts the advantages of titanium alloy frame
(1) can create lightweight and strength of the frame
Pure titanium intensity is higher. In titanium, vanadium adding aluminum and aluminum is more flexible (and), also be helpful for design.
(2) not rust: titanium in general conditions hardly corrosion. But it is another kind of corrosion phenomena is dissimilar metal corrosion. For example, different kinds of alloy in together, become electrode state, local corrosion caused by differences make energized. This phenomenon is ZhiGao measures taken to insulation (mixed with metal powder, such as commodity name: ZhiGao Ti Plepu, etc.). This kind of metal powder to prevent ZhiGao loss, even after the loss is used to prevent close contact. This kind of metal powder is conductive also unimportant, after being contacted smaller load off. This phenomenon is called "stuck" and "roasting", it is different.
"Stuck, occlusive" : metal by the junction between the phenomenon.
"Roasting jointing" : the processing of metal generated when the quantity of heat to dissolve harmony.
(3) ride feeling
Ti is also used in shock springs. Now the frame is made of titanium with suitable for long ride. Some drivers fond of titanium frame, think riding feeling good. However, some different individuals MuGang and chromium after comparison, chromium MuGang frame shock absorption, riding than titanium frame are also good (this than titanium frame and chromium MuGang frame with thin tube shape and the results obtained are increasing stress related). If the titanium tube processing technology improvement, maybe there will be MuGang chromium and same ride.
Some titanium frame, make the person feels it is perhaps use plane tube (did not change, the thickness of padded the tube). Or use high strength of titanium alloy, but not thin tubes have relations.
Titanium alloy frame of responding to shortcomings
The price is high. In the nature of titanium in titanium, practice and form processing complex, high technical requirements and spend time so high cost. Have various processing extremely difficult, because titanium and oxygen, and the air is extremely the affinity of tio2 and immediately after the contact and titanium dioxide becomes hard and brittle, this part of the strength will continue to drop. So with an inert gas welding carefully. Usually said Tig welding is (Tig: tungsten inert gas, LveYu) use tungsten electrode and argon arc welding are connected. Titanium welding must isolate air. Due to the above reasons titanium frame price is very expensive.
Recently, some of the aluminum alloy frame expensive than frame, the titanium alloy frame price decline. If is the end of the cold war, the dosage of titanium spending less. Excellent technician to begin with titanium frame, Production cost of titanium frame etc.
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