Effects of volume fraction and grain size on creep characteristics of .ALPHA./.BETA. titanium alloys.
Year: 1989
Type: article
Abstract: Effects of volume fraction of (x Phaseand grain size on the creep properties of a series of two-phase titanium alloys were examined.The chemical compositions of (~and [••, phases of the alloys were designed to be constant.The alloys were quenched after solution-treatments for I , I OO, and I OOO h at 11 73 K, followed by aging for 4h at 773 K.The volume fraction of (x phase (VFAP) was varied trom 17 to 73 "/•.Creep rupture test was carried out at 392 MPa and 773 K in air The creep rupture life was the longest at 50 "/• of VFAP,and the shortest at the minimumVFAP when the specimens were solution-treated for I and 100 h.It increased with VFAP when solution-treated for I OOO h.Thesteady state creep rates decreased with the increase in VFAP This might be due to the higher creep resistance of the (1 phase lrrespec- tive of the wide range of the average grain sizes, the steady state creep rates become insensitive of grain size as VFAP decreased.This would be attributed to grain boundaries of fine (1 precipitates generated in the prior 13 phase The nucleation of voids occurred in most cases at the (x/~a nd clkl interfaces, and within (1 phase The void growth rate decreased with the volume-fraction-ratio of ~and( x phasesand increased with the average transverse grain size of (x phase.
Source: ISIJ International
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $700
OpenAlex ID: W2069810046