杨模聪林鑫许小静陈静黄卫东
金属学报
采用激光立体成形技术制备了沿沉积方向成分渐变的立墙式Ti60--Ti2AlNb梯度材料, 研究了沉积态Ti60--Ti2AlNb梯度材料的相 与显微组织的演变规律. 随Al和Nb含量的增加, 梯度材料中呈现α+β→α+α' →α' →α+β→α+β/B2+α2 →β/B2+α2→β/B2+α2+O →B2+O → B2的相演变趋势, α相在Ti60到Ti60--60%Ti2AlNb (质量分数) 的成分范围内一直存在. 梯度材料的硬度同样随着Al和Nb含量的增加而增加, 并随着B2+O相的形成达到极大值, 不过随着在Ti2AlNb端部全B2相的获得, 硬度急剧降低. 基于钛合金富Ti区非平衡相图, 结合Al和Nb元素对α, α2,β/B2和O相稳定性的影响分析, 及考虑激光立体成形所具有的反复回火/退火和热积累效应, 对梯度材料在激光立体成形过程中呈现的相演化规律进行了解释.
关键词:
激光立体成形
,
Ti60
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Ti2AlNb
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functionally gradient material
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phase transformation
,
microhardness
Z.M.Xu1)
,
J.S.Zhen1)
,
H.F.Liu1) and L.M.Zhang2) 1)Departent of Chemistry
,
Huazhong University of Science and Technology
,
Wuhan 430074
,
China 2)Institute of Materials Science and Engineering
,
Wuhan University of Technology
,
Wuhan 430070
,
China
金属学报(英文版)
Thispaper proposed a new methodof producing Ceramic/ Metalfunctionally gradient mate rialby electroless platingtechnique. The experimentof producing SiC/ Ni PFGM wascar ried out with self made electroless plating facilities. The results show that the thickness of FGMcoating andthegradientdistribution ofcompositioncanbecontrolled byoptimizingelec trolessplating technology and changing the parameters such as plating time, the additionspeed and concentration of SiCparticles. Analysisdemonstratesthatthereisastrongrelation ship amongthe SiCcontent,the microstructureandthe mechanicalproperty ofthe FGM.
关键词:
electrolessplating
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null
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null
