TA15钛合金中纳米压痕附近残余应力应变场及几何必须位错密度的分布(英文)
2页1、ELSEVIER PressAvailable on line at ScienceDirectTransactions of Nonferrous Metals Society of ChinaTrans. Nonferrous Met. Soc. China 23(2013) 7-Residual elastic stress-strain field and geometrically necessary dislocationdensity distribution around nano-indentation in TA15 titanium alloyDong HE, Jing-chuan ZHU, Zhong-hong LAI, Yong LIU, Xia-wci YANG, Zhi-sheng NONGSchool of Materials Science and Engineering, Harbin Institute ofTechnology, Harbin 150001, ChinaReceived 5 December 2011; accepted 16 F
2、ebruary 2012Abstract: Nanoindentation and high resolution electron backscatter diffraction (EBSD) were combined to examine the elastic modulus and hardness of a and 0 phases, anisotropy in residual clastic stress-strain fields and distributions of geometrically necessary dislocation (GND) density around the indentations within TAI5 titanium allcy. The nano-indention tests were conducted on a and 0 phases, respectively. The residual stress-strain fields surrounding the indentation were calculated
3、 through crosscorrelation method from recorded patterns The GND density distribution around the indentation was calculated based on the strain gradient theories to reveal the micro-mechanism of plastic deformation The results indicate that the elastic modulus and hardness for a phase are 129.05 GPas and 6.44 GPa, while for 0 phase, their values are 109.80 GPa and 4.29 GPa. respectively. The residual Mises stress distribution around the indentation is relatively heterogeneous and significantly in
4、fluenced by neighboring soft 卩 phase. The region with low residual stress around the indentation is accompanied with markedly high (a) type and prismatic-GND density Key words: nano-hardness; stress-strain fields; geometrically necessary dislocation; nanoindentation; electron backscaner diffraction; TA 15 titanium alloyand plastic role in the alloy parts, and near a1 IntroductionTA15, whose nominal chemical component is Ti-6A1 -2ZrTMoTV, was developed as BT20 alloy by Russia in 1964 I. As a typi
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