Hsieh and China's Peng, the eighth seeds, took the first set in a tie-break and romped through the second against their 12th-seeded Australian opponents to claim their first Grand Slam crown.
Peng is the third Chinese to win a Grand Slam doubles title.
It was the third time Dellacqua finished runner-up in a women's doubles final at a Grand Slam. However, she did win the 2011 French Open mixed doubles title with American Scott Lipsky.
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