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| 1 | Role of Ru on the Microstructural Evolution During Long-Term Aging of Ni-Based Single Crystal Superalloys显示文摘Two experimental alloys containing diff erent contents of Ru were investigated to study the eff ect of Ru on the microstructural evolution during long-term thermal exposure.The increase in Ru promoted the formation of cubical,tiny,and evenγ′phase after full heat treatment.Moreover,the samples after full heat treatment were exposed at 1100℃ for diff erent time.Based on the classical model by Lifshitz,Slyozov,and Wagner,the coarsening ofγ′phase of the alloy containing 2.5 and3.5 wt.%Ru during the long-term aging was controlled by the interface reaction and diff usion,respectively.Theγ/γ′lattice misfi t was more negative with the increment of Ru addition,which induced the formation of stable raftedγ′phase in the alloy containing 3.5 wt.%Ru at the initiation of long-term aging.Besides,the increase in Ru reduced the diff usion coeffi cient,which could restrain theγ′phase coarsening.The lowerγ/γ′lattice misfi t of the alloy containing 2.5 wt.%Ru promoted the interface reaction,which induced the rapid coarsening ofγ′phase.Therefore,the increase in Ru improved the microstructural stability of the alloys.On the other hand,the raise of Ru induced'reverse partitioning'behavior,which was eff ective in suppressing the emergence of the topologically close-packed phase(TCP phase).The TCP phase occasionally occurred in the alloy containing 2.5 wt.%Ru,which was attributed to the high temperature and the supersaturation of theγmatrix.Moreover,the TCP phase was determined asμphase,which had a high concentration of Co,Re,Mo,and W.A sketch map describing the evolution of the TCP phase was also constructed. | Wei Song Xin-Guang Wang Jin-Guo Li Ye-Shun Huang Jie Meng Yan-Hong Yang Jin-Lai Liu Ji-De Liu Yi-Zhou Zhou Xiao-Feng Sun | 2020 | Acta Metallurgica Sinica(English Letters)2020，33，12： | 3 |
| 2 | 应力时效对DZ125镍基合金组织演化及蠕变抗力的影响显示文摘通过蠕变性能测试,组织结构观察和晶格常数测定,研究应力时效对DZ125镍基合金组织演化与蠕变抗力的影响。结果表明:合金在980℃、90MPa近服役条件下的蠕变寿命是9714h;蠕变期间,样品中间区域的γ′相优先形成完整的筏状组织,在无应力的肩部区域,γ′相呈现串状形态;随应力时效时间延长至9714h,合金中筏状γ′相的厚度尺寸从0.4μm增加至1.8μm,合金中γ′、γ两相的晶格常数值增加,两相的错配度增大。其中,应力时效致使筏状γ′相粗化及错配度增大,可改善蠕变抗力,是合金在近服役条件具有较长蠕变寿命的原因之一。 | 田宁 田素贵 张宝帅 于慧臣 李秋阳 | 2018 | 中国有色金属学报2018，28，3： | 3 |
| 3 | Ni-Al二元合金γ相高温点阵常数及热膨胀系数的试验与计算研究显示文摘采用高温X射线衍射及热膨胀法,测定了较宽温度范围内γ单相及γ+γ'两相Ni-Al合金中γ相的点阵常数及热膨胀系数。将试验结果与文献中的计算结果进行比较,发现在600~900℃范围内γ相点阵常数与热膨胀系数的试验值均小于Wang等的计算结果;相较于γ单相Ni-Al合金,γ+γ'两相合金中γ相点阵常数的试验值随温度的变化趋势与计算结果更吻合。分析认为,这是由于Wang等的点阵常数模型未考虑两相状态时共格应力对γ相点阵常数的影响。 | 王治超 鲁晓刚 朱娜琼 | 2021 | 上海金属2021，43，4： | 1 |
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