茶丽梅,孙宗宗1,张勇1,林欣1,张羽1,赵新奇1,郝静2.二次退火时间对TNM合金微观组织和硬度的影响[J].湖南大学学报:自然科学版,2019,(6):18~23
二次退火时间对TNM合金微观组织和硬度的影响
Effect of Secondary Annealing Duration on Microstructure and Hardness of TNM Alloy
  
DOI:
中文关键词:  钛铝合金  热处理  硬度  微观结构
英文关键词:titanium aluminum alloy  heat treatment  hardness  microstructure
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作者单位
茶丽梅,孙宗宗1,张勇1,林欣1,张羽1,赵新奇1,郝静2 (1.湖南大学 材料科学与工程学院湖南 长沙4100822.宁波汉诺威大学 机械系浙江 宁波 315000 3.广东以色列理工学院 材料科学与工程系广东 汕头 515063) 
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中文摘要:
      研究了TNM(Ti-Al-Nb-Mo)合金中热处理条件与显微组织、力学性能的关联. 将合金样品先在1 270 ℃下退火后,再分别于800 ℃保温500、1 000和2 000 h. 利用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和显微硬度计分析了具有不同二次退火时间样品的物相、微观形貌及显微硬度的变化. 结果表明:随着退火时间的延长,(α2+γ)层片团边界逐渐粗化,界面处出现更多的βo和γ组成的网络状组织;同时在α2层片内出现更多的纳米级βo颗粒,使单个α2层片中出现α2/βo/α2结构. 由于βo颗粒的硬度较大,且层片内的α2 /βo界面可以阻碍位错的运动,所以TNM合金的硬度随着二次退火时间的延长而有所提高.
英文摘要:
      This study focused on the inner correlation between heat treatment, microstructure and mechanical property of TNM (Ti-Al-Nb-Mo) alloy. The samples were firstly annealed at 1 270 ℃,then kept at 800 ℃ for 500, 1 000 and 2 000 hours,separately. Using X-ray diffraction(XRD),scanning electron microscope(SEM), transmission electron microscope(TEM) and microhardness tester,the phases, microstructures and hardness of the samples bared by varied heat treatments were investigated. It was found that the boundaries of(α2+γ) colonies were boarding when the annealing duration increased;more βo and γ particles precipitated at colony boundaries and formed a cellular structure. At the same time, more nano-scaled βo particles were showed up in the single α2 lamellae,inducing α2 /βo /α2 structure and more interfaces. Therefore,the hardness of TNM alloy can be enhanced with the prolonging of annealing duration due to the bigger hardness of βo particles and α2 /βo interface which can hind dislocation movements additionally.
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