Shaqiq (may Allah have mercy on him) says that Sayyiduna Ali (may Allah be pleased with him) used to say takbir after the Fajr prayer on the morning of Arafah, and he would not stop the takbirs until the imam had led the prayer on the last of the days of Tashriq; then he would say takbir after Asr.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة العيدين / 6275