Liquid Metal Embrittlement of Copper Wires

2000 ◽  
Author(s):  
L. E. Brown
Keyword(s):  
Liquid Metal ◽  
Failure Mechanism ◽  
Liquid Metal Embrittlement ◽  
Electronic Components

Abstract Intermittent opens in hand-assembled electronic components have a number of expected causes. In this case the failure mechanism that was identified is of concern in certain industries, but is unexpected in the electronics business. Solder in solder pots and in flow solder systems is expected to become contaminated with the various metals and other materials that the solder contacts during use. In the analysis presented here, the solder was determined to be contaminated with mercury. This contaminated solder caused wires tinned in the solder to fracture due to liquid-metal embrittlement. Liquid-metal embrittlement (LME) is the reduction in metal ductility caused by contact with liquid metal.

scholarly journals Significance of cutting plane in liquid metal embrittlement severity quantification

2021 ◽  
Vol 3 (6) ◽  
Author(s):  
C. DiGiovanni ◽  
L. He ◽  
C. Hawkins ◽  
N. Y. Zhou ◽  
E. Biro
Keyword(s):  
Liquid Metal ◽  
Cross Section ◽  
Standard Procedure ◽  
Fuel Efficiency ◽  
Zinc Coating ◽  
High Strength Steels ◽  
Absolute Measurement ◽  
Cutting Plane ◽  
Liquid Metal Embrittlement ◽  
Welding Parameters

AbstractThe automotive industry is turning to advanced high strength steels (AHSS) to reduce vehicle weight and increase fuel efficiency. However, the zinc coating on AHSS can cause liquid metal embrittlement (LME) cracking during resistance spot welding. To understand the problem, the severity of the cracking must be measured. Typically, this is done from the weld cross-section. Currently, there is no standard procedure to determine which plane through the weld must be examined to gauge cracking severity, leading to a variety of practices for choosing a cutting plane. This work compares the magnitude and variability of LME severity measured from the plane of exhibiting the most severe surface cracking to arbitrarily chosen planes. The plane exhibiting the most severe cracks had more and longer cracks on the cross-section than the arbitrarily chosen plane, resulting in a higher crack severity measurement. This higher absolute measurement increased the relative accuracy of the examination, allowing for fewer welds to be examined to precisely determine the effect of LME mitigation methods on cracking severity, how welding parameters affect LME cracking severity and the predicted LME affected strength of a particular weld.

Liquid Metal Embrittlement Transport Mechanism in the Fe/Zn System: Stress-assisted Diffusion

Materialia ◽  
2021 ◽  
pp. 101153
Author(s):  
C. DiGiovanni ◽  
A. Ghatei Kalashami ◽  
E. Biro ◽  
N.Y. Zhou
Keyword(s):  
Liquid Metal ◽  
Transport Mechanism ◽  
Liquid Metal Embrittlement

Crack Path and Liquid Metal Embrittlement Specificity of Austenitic Steels in Mercury at Room Temperature

2021 ◽  
Author(s):  
Thierry Auger ◽  
Bassem Barkia ◽  
Eva Héripré ◽  
Vincent Michel ◽  
Denis Mutel ◽  
...  
Keyword(s):  
Liquid Metal ◽  
Room Temperature ◽  
Crack Path ◽  
Liquid Metal Embrittlement ◽  
Austenitic Steels

scholarly journals Liquid Metal Embrittlement of Hot Stamped Galvannealed Boron Steel Sheet – Effect of Heating Time on Crack Formation –

2017 ◽  
Vol 57 (6) ◽  
pp. 1094-1101 ◽  
Author(s):  
Masaru Takahashi ◽  
Masahiro Nakata ◽  
Kazuhito Imai ◽  
Nobusato Kojima ◽  
Nobuo Otsuka
Keyword(s):  
Liquid Metal ◽  
Steel Sheet ◽  
Crack Formation ◽  
Heating Time ◽  
Liquid Metal Embrittlement ◽  
Boron Steel
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