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Measurement of Mechanical Properties of Sn--Ag--Cu Bulk Solder BGA Solder Joint Using Nanoindentation |
WANG Fengjiang; QIAN Yiyu; MA Xin |
State Key Laboratory of Advanced Welding Production Technology; Harbin Institute of Technology; Harbin 15000 |
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Abstract Berkovich nanoindentation tests with different loading rates
have been performed on the Sn--3.0Ag--0.5Cu bulk
solder and Sn--4.0Ag--0.5Cu lead--free ball grid array (BGA) solder joint.
The load--depth curves are rate dependent.
The Young's modulus of bulk solder and BGA joint obtained from
load--depth curves with Oliver--Pharr method are 9.3 and 20 GPa
respectively. The creep rate sensitivity of bulk solder and BGA
joint obtained from curves with the
concept of “work of indentation”
are 0.1111 and 0.0574 respectively. The mechanical properties of
Sn--Ag--Cu lead-free solder are typically size dependent.
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Received: 22 February 2005
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Corresponding Authors:
WANG Fengjiang
E-mail: wangfj@hit.edu.cn
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