A Scientific Research Team Of Liangjiang Collaborative Innovation Zone Overcomes Difficulties in The Field Of Alloys

A scientific research team of Liangjiang Collaborative Innovation Zone overcomes difficulties in the field of alloys

Recently, the Chongqing Liangjiang Collaborative Innovation Zone settled in the university institute. The high temperature creep properties of the alloy are improved.

It is understood that γ-TiAl alloy has low density, high specific strength and excellent high temperature oxidation resistance and creep resistance. It is a potential lightweight high temperature structural material in the service temperature range of 650-850 °C. and the other heat-resistant parts have broad application prospects.

As a typical representative of the third generation γ-TiAl alloy, although the service temperature of TNM alloy can reach 750 °C, the high temperature disordered β phase is cooled to room temperature and transformed into an ordered β0 phase, which is distributed in (α2+ γ) At the interface of lamellar clusters, under high temperature service conditions, the content of β0 phase not only increases, but also precipitates the hard and brittle ω phase. With the accumulation of creep deformation, the hard and brittle β0/β0(ω) and The strain incongruity of the surrounding α2/γ sheets leads to stress concentration, which provides nucleation sites for holes and cracks, and exacerbates creep failure.

How to control the size, content and distribution of β/β0 phase and improve the microstructure stability has always been a hot issue in the field of γ-TiAl alloys.

The team of Prof. Hongchao Kou successfully prepared a full-sheet TNM alloy by using the powder hot isostatic pressing method. After aging treatment at 1050℃/2h, a small amount of finely dispersed β0 phase was precipitated in the α2/γ lamellae, which significantly improved the high temperature creep of the alloy. variable performance.

It is also understanding that Professor Kou Hongchao is currently the chief engineer in Chongqing Lianghang Metal Materials Co., Ltd. (hereinafter referred to as "Chongqing Lianghang"), an incubation enterprise of Chongqing Science and Technology Innovation Center of Northwestern Polytechnical University. Right now, the first phase of the industrialization project of Chongqing Two Airlines has been completed and put into using, and equipment installation and commissioning being carried out. It is expected that the first batch of products will be delivered to customers  at early next year.

Relying on the key core technology of the titanium alloy casting industry, Chongqing Two Airlines focus on breaking through the technological bottleneck restricting the manufacturing of key components of high-end equipment, and accelerate the independent control of key core components in aviation, aerospace, weapons, nuclear industry, and rail transit. After the project is put into production, it will be built with The important influence of the titanium alloy aerospace key parts precision forming and "pre-research, digital twin, testing, pilot test, iterative optimization and low-cost engineering" as a whole, market application-oriented "production-university-research-use" advanced The manufacturing center helps Chongqing to become a world-class manufacturing base for key parts of aerospace and high-end equipment.