The effect of zirconium addition on sintering behaviour, microstructure and creep resistance of the powder metallurgy processed alloy Ti–45Al–5Nb–0.2B–0.2C

RETRACTED: Characterization of Particulate-Reinforced Aluminium 7075 / TiB2 Composites

“…The formation of a Zr-enriched γ phase at colony boundaries was promoted by elemental Zr additions, which was an effect of the specific powder metallurgy processing of these alloys. The results shows Zr will increase the hardenss and creep resistance [9] . Fine grained beta titanium alloy (Ti-40Nb) was successfully prepared by mechanical alloying of TiH 2 and Nb by spark plasma sintering which increases hardness with increase in temperature.…”

On an extraordinarily high strength of a two-phase VT8-based titanium alloy heavy alloyed with zirconium

“…По классификации А. И. Хорева [4], полученные для сплава ВТ8-20Zr-0,1B свойства дают основания причислить этот сплав к сверхпрочным титановым сплавам (с прочностью 1300 -1800 МПа и более), что раньше достигалось только для β и α + β титановых сплавов с более высоким содержанием β-стабилизирующих элементов и относительно низкой рабочей температурой. Как отмечалось, цирконий относится к нейтральным упрочнителям, который предположительно не понизит жаропрочные свойства (сопротивление ползучести) сплава, а наоборот -повысит их [13]. Можно ожидать и повышения усталостной прочности в результате легирования цирконием.…”

Joining of Powder Metallurgy Beta Gamma Titanium Aluminide Through Diffusion Brazing

“…The Clemens group has primarily focused on castings as the starting material with follow on HIP'ing, forging, and/or heat treatments to generate various microstructures. Additional powder metallurgy (P/M) research [30,31], as well as joining trials have also been reported by the research group for beta solidified titanium aluminides [32].…”

“…Since the time to 1% strain was not achieved at 140 MPa, a Larson-Miller plot was generated for both the time to 0.5% strain and 1.0 % strain ( Figure 6 Ti-44.5Al-6.25Nb-0.8Mo-0.1B [143], Ti-43.5Al-4Nb-1Mo-0.1B-0.5C [144], Ti-43.5Al-4Nb-1Mo-0.1B [28], Ti-48Al-2W [142], Ti-45Al-5Nb-5Zr-0.2B-0.2C [31], Ti-48Al-2Cr-2Nb-1W [145], Ti-45Al-2W-0.6Si-0.7B [146])…”

“…The microporosity defect may act to reduce the load bearing cross section of the creep sample as well as act as crack nucleation sites. It has been found that the size, quantity, and distribution of pre-existing porosity in both cast and P/M metallic components will impact both the rupture time and rupture strain [31,153,154]. Since the nucleation, growth, and coalescence of voids usually occurs at grain boundaries, pre-existing porosity eliminates the need to nucleate voids from collections of vacancies which leads to a randomizing time to failure based on the morphology of the porosity field [155].…”