The South China University of Technology

Lehua Liu

Chao Yang

Yuanyuan Li

Weiping Chen

Yaguang Yao

Shengguan Qu

Limei Kang

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.

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Guangzhou, China

Lehua Liu