铝合金 7050 板材信息

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A L L O Y D E S C R I P T I O N

This alloy is used in aircraft structural parts. The alloy has characteristics of high strength coupled with good resistance to exfoliation and stress corrosion cracking. The alloy also has good fracture toughness and fatigue resistance.

T Y P I C A L M E C H A N I C A L P R O P E R T I E S ( L O N G I T U D I N A L )

Temper

Tensile (.500" Dia. Specimen)

Hardness

Shear

Fatigue*

Modulus

 

 

Ultimate

 

Yield

 

Elongation/4D

Brinell 500kg 10 mm

Ultimate Shearing Strength

 

Endurance Limit -

R.R. Moore Type

 

Modulus of Elasticity

KSI

MPa

KSI

MPa

%

 

KSI

MPa

KSI

MPa

KSI x 103

Gpa

T7651

80

552

71

489

11

150

47

324

-

-

10.2

70.3

T7451

76

524

68

469

11

140

44

303

-

-

10.2

70.3

*5 x 10E8 cycles of reversed stress

 

C O M P A R A T I V E C H A R A C T E R I S T I C S

Temper

Corrosion Resistance

Cold Workability3

Machinability3

Anodize Response3

Brazeability4

Weldability4

 

General1

Stress2

 

 

 

 

Gas

Arc

Spot

T7651

C

B

D

B

B

D

D

D

B

T7451

C

B

D

B

B

D

D

D

B

 

1       Ratings A through E are relative ratings in decreasing order of merit, based on exposures to sodium chloride solution by intermittent spraying or immersion. Alloys with A and B ratings can be used in industrial and seacoast atmospheres without protection. Alloys with C, D and E ratings generally should be protected at least on faying surfaces.

2       Stress-corrosion cracking ratings are based on service experience and laboratory tests of specimens exposed to the 3.5% sodium chloride alternate immersion test. A= No known instance of failure in service or in laboratory tests.

B= No known instance of failure in service; limited failures in laboratory tests of short transverse specimens.

C= Service failures with sustained tension stress acting in short transverse direction relative to grain structure; limited failures in laboratory tests of long transverse specimens.

D= Limited service failures with sustained longitudinal or long transverse

3       Ratings A through D for Workability (cold), A through E for Machinability and A through C for Anodize Response, are relative ratings in decreasing order of merit.

4       Ratings A through D for Weldability and Brazeability are relative ratings defined as follows: A= Generally weldable by all commercial procedures and methods.

B= Weldable with special techniques or for specific applications that justify preliminary trials or testing to develop welding procedure and weld performance. C= Limited weldability because of crack sensitivity or loss in resistance to corrosion and mechanical properties.

D= No commonly used welding methods have been developed.

 

 

 

 

 

 

 

C H E M I C A L C O M P O S I T I O N L I M I T S

Continued Page 2 of 2

 

 

Others

Weight %

Si

Fe

Cu

Mn

Mg

Cr

Zn

Ti

Zr

Each

Total

Minimum

-

-

2.0

-

1.9

-

5.7

-

0.08

-

-

Maximum

0.12

0.15

2.6

0.10

2.6

0.04

6.7

0.06

0.15

0.05

0.15

 

T Y P I C A L P H Y S I C A L P R O P E R T I E S

Characteristic

 

English

Metric

Nominal Density (68 °F/20 °C)

 

0.102 lbs./in.3

2.83 Mg/m3

Melting Range

 

870 °F - 1175 °F

524 °C - 635 °C

Specific Heat (212 °F/100 °C)

 

0.21 BTU/lb. - °F

860 J/kg - °K

 

 

 

Coefficient of Thermal Expansion

 

Linear

68 °F-212 °F

20 °C-100 °C

 

13.1 micro in./in.-°F

 

23.5 micro m/m -°K

 

Volumetric 68 °F/20 °C

 

3.78 x 10-5in.3/in.3 -°F

 

68 x 10-6m3/m3 -°K

 

Thermal Conductivity (68 °F/20 °C)

T7651

89 BTU/ft. - hr. - °F

154 W/m - °K

T7451

91 BTU/ft. - hr. - °F

157 W/m - °K

 

Electrical Conductivity (68 °F/20 °C)

 

Equal Volume

T7651

39.5% IACS

T7451

40.5% IACS

 

2020年8月12日 17:06
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