Polycrystalline diamond compacts and related products

A polycrystalline diamond compact, comprising:

• a cemented carbide substrate including a plurality of carbide grains cemented with a cementing constituent, wherein the cementing constituent includes a cobalt-based alloy having at least one eutectic forming alloying element in an amount at or near a eutectic composition for an alloy system of cobalt and the at least one eutectic forming alloying element;
• and
• a preformed polycrystalline diamond table attached to the substrate that includes a first region adjacent to the substrate and a second region remote from the substrate, the preformed polycrystalline diamond table including a plurality of bonded diamond grains defining a plurality of interstitial regions, at least a portion of the plurality of interstitial regions of the first region includes the cobalt-based alloy of the substrate disposed therein while the plurality of interstitial regions of the second region are substantially free of the cobalt-based alloy.

A polycrystalline diamond compact, comprising:

• a cemented carbide substrate;
• and
• a preformed polycrystalline diamond table attached to the substrate, the preformed polycrystalline diamond table including a plurality of bonded diamond grains defining a plurality of interstitial regions, at least a portion of the plurality of interstitial regions including a cobalt-based alloy disposed therein, wherein the cobalt-based alloy includes at least one eutectic forming alloying element in an amount at or near a eutectic composition for an alloy system of cobalt and the at least one eutectic forming alloying element, wherein the at least one eutectic forming alloying element is selected from the group consisting of carbon, phosphorus, antimony, and tin.