The South China University of Technology

Shengguan Qu

Chao Yang

Yuanyuan Li

Yaguang Yao

Weiping Chen

XiaoQiang Li

Weiwen Zhang

Limei Kang

Lehua Liu

A high-strength dual-scale structure titanium alloy, a preparation method therefor, and an application thereof, belonging to the technical field of alloy processing. The composition system of the titanium alloy is Ti&#x2014;Nb&#x2014;Cu&#x2014;Co&#x2014;Al, the atomic percentage of the various elements being 58&#x2dc;70% Ti, 9&#x2dc;16% Nb, 4&#x2dc;9% Cu, 4&#x2dc;9% Co, and 2&#x2dc;8% Al. The microstructure comprises a dual-scale coexistence of micro-crystal isometric bcc &#x3b2;-Ti and ultra-fine crystal isometric bcc &#x3b2;-Ti, and a dual-scale coexistence of micro-crystal strip fcc CoTiand ultra-fine crystal isometric fcc CoTi, or an ultra-fine crystal strip fcc CoTitwin crystal is distributed along a boundary of a dual-scale substrate, the dual-scale substrate being a nano needle-shaped martensite a' phase dispersed within micro-crystal bcc &#x3b2;-Ti. The mechanical properties of the titanium alloy are significantly improved, and the titanium alloy may be used in fields such as aerospace and aviation, weaponry and sports equipment.

High-strength dual-scale structure titanium alloy, preparation method therefor, and application thereof

The present invention belongs to the technical field of the preparation of alloy materials, and discloses a high strength and toughness alloy material, a method for preparing the alloy material by semi-solid sintering, and application thereof. The preparation method comprises the three steps of mixing powders, preparing alloy powders by high-energy ball milling, and semi-solid sintering of alloy powders, the key point lies in the two-step sintering, wherein the temperature is heated to less than the initial melting temperature of the lowest-temperature melting peak of the alloy powder, under the sintering pressure conditions, and carried out a sintering densification treatment; after pressure release, the temperature is heated to the sintering temperature Ts, and maintained at the same temperature, and a semi-solid processing is carried out, with a sintering temperature Ts: Ts&#x2265;the initial melting temperature of the lowest-temperature melting peak of the alloy powder, Ts&#x2264;the initial melting temperature of the highest-temperature melting peak of the alloy powder. By using the present method, a variety of high melting point alloy systems comprising such as Ti-based, Ni-based alloy system, and the like are carried out a semi-solid processing, so as to obtain an alloy material with a novel microstructure such as nanocrystalline, ultra-fine crystalline, fine crystalline or bimodal structure, and the like, and having excellent performances, which can be widely used in the fields of aerospace, military, instruments and the like.

Alloy material with high strength and toughness and its fabrication method of semi-solid sintering

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Guangzhou, China

Shengguan Qu