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文章编号:1004-0609(2010)S1-s0257-03 Ti-22Al-24Nb-1Mo O相合金箔材的加工与性能 卢 斌,王 永,杨 锐 (中国科学院 金属研究所,沈阳 110016) 摘 要:介绍了一种采用b相区开坯,α2+B2相区热轧,利用四辊可逆冷轧机冷轧Ti-22Al-24Nb-1Mo O相合金0.1 mm厚箔材的工艺过程.研究轧后退火和固溶处理对合金箔材组织和拉伸性能的影响.结果表明:退火后合金组织由等轴O相+B2相组成,其中O相(体积分数)约50%;固溶后合金组织由少量等轴O/α2相+B2相组成;经两种热处理工艺处理后,合金均能获得良好的室温拉伸性能. 关键词:O相合金;Ti-22Al-24Nb-1Mo箔材;冷轧;热处理 中图分类号:TG 166.5  ......
development of lamellar structure of an orthorhombic Ti2AlNb-based Ti-22Al-26Nb-1Zr alloy, including B2 decomposition and spheroidization of O phase, was investigated. The results show that the lamellar structure is fabricated by heating the samples in the single B2 phase field and cooling slowly in the furnace. Aging treatments are conducted in the (O+B2) phases field by air cooling. After aging......
and subsequently annealed Ti49.2Ni50.8 alloys consist of B2 parent phase, Ti4Ni2O phase and B19′ martensite at room temperature. Upon cooling, all samples show B2→R→B19′ two-stage transformation. Upon heating, when the annealing temperature is less than 400 °C, the samples show B19′→R→B2 two-stage transformation; when the annealing temperature is higher than 500 °C, the samples show B19′→B2 single-stage......
验研究退火态Ti-50.8Ni-0.5V(摩尔分数,%)形状记忆合金的相变行为,组织特征和力学性能.结果表明:400~700 ℃退火态Ti-50.8Ni-0.5V合金室温组成相为母相B2和马氏体B19′.随退火温度升高,该合金冷却/加热时的相变类型由B2→R/R→B2型向B2→R→B19′/B19′→R→B2型向B2→R→B19′/B19′→B2型向B2→B19′/B19′→B2型转变;R相,马氏...结果 2.1 相组成 图1所示为400~700 ℃退火态Ti-50.8Ni-0.5V合金室温XRD谱.由图1可知,该合金室温下主要由母相B2和马氏体B19′相组成,以母相为主.由于SME与B19′相对应,SE与B2相对应[19],故Ti-50.8Ni-0.5V合金室温下将主要呈现SE特性. 2.2 相变行为 2.2.1 相变类型 350~800 ℃退火态......
,有序的B2相转变成无序的β相,且体积增加;在870 ℃时效时,除有条状O相析出外,还有O+B2相混合物存在,随着保温时间延长至24 h,析出的魏氏O相条粗化并趋向均匀,而O+B2相混合物消失;当固溶处理温度较高(1 010 ℃)时,在750 ℃时效伴随有胞状反应,O相以块状形态从B2晶粒中不连续析出;在870 ℃时效,析出的O相条的长宽比减小,且随着时间的延长,O相变粗并逐渐球化,B2晶界处的B2... Ti-22Al-25Nb alloy. For as-forged alloy solution-treated at lower temperature, O precipitates get coarse gradually with elongation aging time, and the volume fraction of ordered B2 phase transiting......
Fe-Al合金有序化过程中的内耗峰 迟静1,姚树玉1,崔洪芝1,韩福生2,吴杰1 (1.山东科技大学材料科学与工程学院,青岛,266510;2.中国科学院固体物理研究所材料物理重点实验室,合肥,230031) 摘要:利用内耗方法对B2 Fe-Al合金的有序化过程进行了研究,并分析了有序化过程与原子换位运动之间的关系.对于油冷Fe47Al53合金,在570℃左右观察到一个内耗峰;但是对于炉冷样品,该峰并不出现.这个内耗峰具有典型的相变峰特征,XRD和DSC显示,该峰的出现与样品的有序化过程有关,它产生于反位链原子通过最近邻的空位向自身亚晶格位置的跳动. 油冷Fe57Al43合金中类似的峰出现在540℃附近. 关键词:B2; Fe-Al合金; 内耗; 有序度; 反位置原子; [全文内容正在添加中] ......
Cr掺杂对Ti-Ni形状记忆合金相变和循环形变特性的影响杨军1,贺志荣2,王芳3,王永善1(1.陕西省汉中市陕西理工学院材料科学与工程系2.陕西理工学院 材料科学与工程学院3.陕西理工学院 图书馆)摘 要:使用示差扫描量热仪(DSC)和拉伸实验研究了Cr掺杂对550℃退火态Ti-50.8Ni(原了分数,%)形状记忆合金相变和循环形变特性的影响.结果表明,Ti-50.8Ni合金冷却/加热时发生B2→R→M/M→B2型可逆相变,掺杂0.3%Cr后所得Ti-50.8Ni-0.3Cr合金的相变类型为B2→R→M/M→R→B2,相变温度大幅度降低.室温下,Ti-50.8Ni和Ti-50.8Ni0.3Cr合金的相组成均为母相B2,前者呈现形状记忆效应,后者呈现超弹性.随循环变形次数n的增加,Ti-50.8Ni合金的特......
primarily along the grain boundaries in the weld when the Ti2AlNb circular welded joints are heated up to about 700 °C. During the heat treatment, an almost complete transformation of B2→O happens while the temperature goes up through the O single-phase region. Then, O→B2+O phase transformation occurs primarily along the grain boundaries as the weld metal continues to heat up to the B2+O dual-phase......
that the B1 structure of ZrC is energetically more favorable with lower heat of formation than the B2 structure, and that mechanical instability and positive heat of formation induce the inexistence of the B2 structure at normal pressure. It is also found that the B1 structure would transform to the B2 structure under high pressure below the critical point of V/V0=0.570. In addition, various thermodynamic......
不同热处理过程中的微观组织转变,测试所得组织状态下的合金拉伸性能.对该合金的微观组织转变规律以及与拉伸性能的关系和机理进行分析.结果表明,在固溶处理过程中,组织中原有的α2相颗粒和O相板条因溶解而减少,B2相基体含量相应增大;固溶处理温度升高可加剧各相含量的变化趋势,并在这一过程中伴随着B2相的再结晶且α2相和O相的存在对B2相的再结晶有限制作用;在时效过程中,O相以细小二次板条形式从B2相基体中... tested. The law of microstructure transition and the relationship between the microstructure and the properties were analyzed. The results show that during the solution process, the content of B2 matrix......