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1前言Ti─3Al─2.5V合金是美国研制开发的近α型钛合金，它不仅具有良好的室温、高温机械性能和耐腐蚀性能，而且具有优异的冷、热加工工艺塑性和焊接性能．主要用于制造飞机管路系统．近年来，国际市场上采用该合金管材制造的自行车也十分畅销．但是由于其生产成本较高，造成
1 Introduction Ti ─ 3Al ─ 2.5V alloy is the United States developed nearly α-type titanium alloy, which not only has good room temperature, high temperature mechanical properties and corrosion resistance, but also has excellent cold and hot processing plasticity and welding performance. Mainly used in the manufacture of aircraft pipeline system. In recent years, the bicycle made of the alloy pipe in the international market is also very popular. However, due to its high production costs