EFFECT OF PRIMARY AND SECONDARY ALPHA PHASE ON TENSILE PROPERTY AND FRACTURE TOUGHNESS OF Ti-1023 TITANIUM ALLOY

Acta Metall Sin

2007, Vol. 43

Issue (11): 1129-1137 DOI:

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EFFECT OF PRIMARY AND SECONDARY ALPHA PHASE ON TENSILE PROPERTY AND FRACTURE TOUGHNESS OF Ti-1023 TITANIUM ALLOY

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. EFFECT OF PRIMARY AND SECONDARY ALPHA PHASE ON TENSILE PROPERTY AND FRACTURE TOUGHNESS OF Ti-1023 TITANIUM ALLOY. Acta Metall Sin, 2007, 43(11): 1129-1137 .

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Abstract Ti-1023 is a typical near-β titanium alloy, which has attracted extensive attention for such particular advantages as good damage tolerance and deeper hardenability as compared with its congeners. In present article, individual and collective effects of primary and secondary  phase on tensile property and fracture toughness were systematically investigated on Ti-1023 titanium alloy. It was found that the volume fraction of primary  phase (p) plays the main role in influencing the tensile properties by way of altering the concentration of solute atoms in metastable β phase, while the p morphology plays the minor role. Pronounced effect of secondary  phase (s) on tensile properties was observed, depending on the amount, morphology and size of s. And the strengthening effect secondary  phase is weakened with increasing of the volume fraction of p. Limited effect of p on fracture toughness of Ti-1023 alloy was found and better balance between fracture toughness and strength can be achieved by way of lowering volume fraction of p and increasing amount and size of s particles.

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