They are now on course to do likewise in the men's individual event after Zhang and Wang overcame Hong Kong's Jiang Tianyi and Japan's Seiya Kishikawa respectively.
Zhang was given problems by Vladimir Samsonov of Belarus in the last round, eventually coming from 3-2 down to win in seven games.
There were no such issues here, however, as the world number one booked a last-four clash with Germany's Dimitrij Ovtcharov via a 4-1 (11-4 8-11 11-4 11-9 11-6) success.
Wang eased to a straight-games (11-4 11-5 11-3 11-5) win to set up a match against Taiwan's Chuang Chih-yuan in the next phase.
Should either Zhang or Wang win gold, they would become only the fourth man to win a Grand Slam, gained by emerging victorious in the World Championships, World Cup and the Olympic Games.
One of the three men to achieve the feat is their coach, Liu Guoliang.
He said: 'Every player wants to win the Grand Slam and now they are just two steps away. I really hope one of them does it.'