AbstractGold wires of different chemistry (denoted as Types A and B) are ballbonded on identical metallization and isothermally aged at 175°C. In both wire types the same intermetallic compounds Au4Al and Au8Al3 grow with parabolic time dependence as long as there is a supply of Al from the bondpad. After Al is completely reacted, composition of intermetallics in Type A wire remains unchanged but in Type B wire, the Au8Al3 compound undergoes a phase transformation into a second layer of Au Al. The phase transformation does not affect mechanical reliability of the ballbonds. Intermetallic growth kinetics, growth sequence and the possible origins of the phase transformation are discussed.

中文翻译：

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175°C 老化时金球键中的金属间化合物生长：两种不同化学成分的 4N 线之间的比较

摘要 不同化学成分的金线（表示为 A 型和 B 型）球焊在相同的金属化层上，并在 175°C 下等温老化。在两种导线类型中，只要有来自焊盘的铝供应，相同的金属间化合物 Au4Al 和 Au8Al3 就会以抛物线时间依赖性生长。在 Al 完全反应后，A 型线中金属间化合物的成分保持不变，但在 B 型线中，Au8Al3 化合物发生相变，变成第二层 Au Al。相变不影响球焊剂的机械可靠性。讨论了金属间化合物的生长动力学、生长顺序和相变的可能起源。