全片层BT18Y钛合金在相区固溶时的显微组织演化

金属学报

2005, Vol. 41

Issue (7): 713-720

论文

本期目录 | 过刊浏览

全片层BT18Y钛合金在相区固溶时的显微组织演化

杨义徐锋黄爱军李阁平

中国科学院金属研究所; 沈阳110016

Evolution of Microstructure of Full Lamellar Titanium Alloy BT18Y Solutionized At Phase Field

YANG Yi; XU Feng; HUANG Aijun; LI Geping

Institute of Metal Research; The Chinese Academy of Sciences; Shenyang110016

引用本文:

杨义; 徐锋; 黄爱军; 李阁平 . 全片层BT18Y钛合金在相区固溶时的显微组织演化[J]. 金属学报, 2005, 41(7): 713-720 .
, , , . Evolution of Microstructure of Full Lamellar Titanium Alloy BT18Y Solutionized At Phase Field[J]. Acta Metall Sin, 2005, 41(7): 713-720 .

全文: PDF(719 KB)

摘要: 对BT18Y(Ti--6.9Al--3.6Zr--2.7Sn--0.7Mo--0.6Nb--0.21Si)钛合金进行了一系列的固溶处理, 利用OM, SEM和TEM观察了在+两相区固溶后的显微组织形貌, 发现连续的晶界相发生了球化, 一部分晶内初生片端部具有“叉形”结构。分析了球化的原因和“叉形”结构的形成机理：晶界相表面曲率不同造成的溶质浓度差异而引起的扩散是晶界相球化的根本原因, 不同晶界片的交接对球化有一定的贡献；晶内初生片的各个部位与相之间的相界面结构和界面能的不同是造成+相区固溶时片端“叉形”形貌的主要原因, 片端面与相之间为高界面能易移动的非共格界面, 在固溶时相容易在该处向片内生长形成片, 与之对应的片便出现了“叉形”结构。

关键词 ： BT18Y钛合金, 晶界, 相, 球化

Abstract：BT18Y titanium alloy was treated with several groups of heat treatment. After solutionized frectment at phase field, metalloscopy, transmission electron Microscope (TEM) and scanning electron microscopy (SEM) were employed to observe the microstructures. It was found that the continuous grain boundary (GB) phase is spheroidizes and the edges of some intragranular primarylaths show “forked” morphology. The ultimate reason of the spheroidization of GB is the diffusion of solute atoms due to the difference of solute concentration, which results from the different interfacial curvatures at different sites. The joint of two GB lamellas also gives some contribution to the spheroidization of GB . The “forked” morphology at the edge of primary lath results from different interfacial structures and energies between phase and different parts oflath. The incoherent interface between phase and the edge of lath has high interfacial energy and moves easily. When the alloy is solutionized at phase field, phase trends to grow into lath and forms lath, which results the “forked” morphology of primary lath.

Key words： BT18Y titanium alloy spheroidization “forked” morphology

收稿日期: 2004-10-11

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