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研究了锡元素对钛合金组织与力学性能的影响,综述了Ti-(0~20)Sn合金(质量分数,%)的强化机理。在纯钛中添加不同含量的纯锡进行熔炼,结果发现铸态钛锡二元合金的强化机制不仅与合金中的锡含量有关而且还受到马氏体形貌的影响。硬度和冲击韧性变化曲线在锡含量为10%时出现一个拐点,伸长率变化曲线在含锡量为15%时出现一个转折点。这是因为,当锡含量低于10%时合金组织为条状马氏体,锡含量达到和高于15%时组织为针状马氏体。XRD结果显示所有Ti-(0~20)Sn合金组织为α-Ti。锡含量增加导致针状马氏体的出现是因为锡降低了Ms点。
The effect of tin on the microstructure and mechanical properties of Ti alloy was studied. The strengthening mechanism of Ti- (0-20) Sn alloy (mass fraction,%) was reviewed. The addition of different amounts of pure tin to pure titanium for smelting results in the finding that the strengthening mechanism of the as-cast titanium-tin alloy is not only related to the tin content in the alloy but also affected by the martensite morphology. The curves of hardness and impact toughness show an inflection point when the content of tin is 10%. The curve of elongation shows a turning point when the content of tin is 15%. This is because, when the tin content is less than 10%, the alloy structure is strip-shaped martensite, and when the tin content is higher than 15%, the structure is acicular martensite. XRD results show that all Ti- (0 ~ 20) Sn alloy is α-Ti. The increase of tin content leads to the appearance of acicular martensite because tin decreases Ms point.