Baienwei Al-Si alloys(Si content from 27%—70%) is a silicon particles reinforced aluminum matrix composites formed by improving Si supersaturation in aluminium matrix. AlSi controlled expansion alloys have the features such as low CTE, low density, high thermal conductivity, high electrical conductivity(excellent EMI/RF shielding performance), high hardness,good thermo-mechanical stability,hermeticity, machinability, platability and compatible with microelectronic assembly technology etc.
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Al-Si Alloy Properties
Grades
Content
wt%
CTE 25℃ ppm/℃
Thermal Conductivity 25℃W/mK
Density g/cm³
Tensile Strength MPa
Yield Strength MPa
Poisson’s Ratio
Elongation
%
Elastic Modulus GPa
AlSi27
Al-27%Si
17
175
2.64
170
130
0.29
3.8
91
AlSi35 F
Al-35%Si
15.1
152
2.54
165
95
--
2.5
85
AlSi42
Al-42%Si
13.5
160
2.55
200
187
0.29
1
105
AlSi50
Al-50%Si
11.5
140
2.5
220
210
0.28
<1
108
AlSi60
Si-40%Al
9
125
2.46
181
181
0.27
<1
121
AlSi70
Si-30%Al
7.5
120
2.43
138
138
0.25
<1
131
AlSi80
Si-20%Al
6
110
2.40
125
125
--
--
132
BEW 6061 and BEW 4047 Performance Parameters (produced by Rapid Solidification)
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