Meaning
Material degradation analysis at the microscopic scale identifies the root causes of physical fractures or solder joint fatigue in electronic hardware. A microstructural failure report compiles the results of these microscopic investigations, detailing how and why a component or assembly failed. This document provides the engineering team with the evidence needed to modify the manufacturing process or change the material supplier.
Analytical Technique
Cross-sectional analysis and scanning electron microscopy are used to examine the grain structures and boundary layers of failed joints. In high-reliability applications, the microstructural failure report describes the presence of intermetallic compounds or voids that occurred during the soldering process. These detailed visual records show whether the solder joint suffered from excessive heat or mechanical stress during assembly.
Failure Causation
Mechanical vibration in the field can accelerate cracks along weak boundary lines in the crystalline structure of the metal. Identifying these thermal or mechanical stress patterns in the microstructural failure report helps the quality assurance team pin down when the damage occurred. If the crack began during the reflow stage, the thermal profile of the oven must be adjusted.
Release Process
Sourcing and procurement teams use the finalized document to hold suppliers accountable for defective parts. These reports give the buyer the necessary evidence to demand replacement lots or redesigned boards. This protocol secures the supply chain.
