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近α型耐热钛合金的合金化,面临着热强性和冶金稳定性间的矛盾。实验用两个Ti-Al-Sn-Zr系的近α型合金作为基础合金,分别加入从0.25到0.70%的硅,和分别加入从1.0到4.5%的镓或者锑,来考察硅、镓和锑在500～600℃温度范围内,对合金的热强性和冶金稳定性的影响。实验结果表明,硅能显著地提高合金的热强性,但是,如果合金的铝当量较高并接近于9时,将显著损害合金的冶金稳定性。镓是显著地提高合金的热强性、但也是比较强烈地损害合金的冶金稳定性的元素。锑在加入约1%的条件下,能显著地提高合金的热强性,但加入量增高,作用减弱,并将损害合金的冶金稳定性。实验结果为创制在550～600℃、工作50小时以上,在500～550℃、工作100小时以上的耐热钛合金提供了数据。
Almost α-type heat-resistant alloying of titanium alloys, are facing the conflict between the thermal strength and metallurgical stability. Experimental Two Ti-Al-Sn-Zr based near-α alloys were used as a base alloy, silicon was added from 0.25 to 0.70%, and gallium or antimony from 1.0 to 4.5% was added respectively to investigate the effects of silicon, gallium and Antimony in the temperature range of 500 ~ 600 ℃, the alloy’s thermal strength and metallurgical stability. The experimental results show that silicon can significantly improve the thermal strength of the alloy, but if the alloy has a high aluminum equivalent and close to 9, the metallurgical stability of the alloy will be significantly impaired. Gallium significantly improves the hot strength of the alloy, but it is also an element that strongly deteriorates the metallurgical stability of the alloy. The addition of about 1% antimony can significantly improve the thermal strength of the alloy, but the addition amount increases, the effect weakened, and will damage the metallurgical stability of the alloy. Experimental results for the creation of 550 ~ 600 ℃, working more than 50 hours, at 500 ~ 550 ℃, work more than 100 hours of heat-resistant titanium alloy provides data.