EFFECTS OF HIGH TEMPERATURE SHORT TIMEAGEING TREATMENT ON THE MICROSTRUC-TURES AND MECHANICAL PROPERTIES OFMg-3Nd-1Zn ALLOY

doi:10.11900/0412.1961.2015.00333

Acta Metall Sin

2016, Vol. 52

Issue (5): 567-574 DOI: 10.11900/0412.1961.2015.00333

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EFFECTS OF HIGH TEMPERATURE SHORT TIMEAGEING TREATMENT ON THE MICROSTRUC-TURES AND MECHANICAL PROPERTIES OFMg-3Nd-1Zn ALLOY

Wenhui WANG^1,²,Di WU¹(

),Rongshi CHEN¹,Changsheng LOU²

1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 School of Materials Science and Engineering, Shenyang Ligong University, Shenyang 110159, China

Cite this article:

Wenhui WANG,Di WU,Rongshi CHEN,Changsheng LOU. EFFECTS OF HIGH TEMPERATURE SHORT TIMEAGEING TREATMENT ON THE MICROSTRUC-TURES AND MECHANICAL PROPERTIES OFMg-3Nd-1Zn ALLOY. Acta Metall Sin, 2016, 52(5): 567-574.

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Abstract

Among the traditional cast magnesium alloys system, Mg-3Nd-1Zn alloy with high strength and heat resistance, has been widely applied in aeronautics such as in engine box and wing rib of airplane. In present research, the as-cast Mg-2.7Nd-0.6Zn-0.5Zr (NZ31) alloy was solution treated and then aged at temperatures ranging from 200 ℃ to 300 ℃. The microstructures and mechanical properties of the aged specimens especially at relatively high temperature (225~300 ℃) were systematically characterized by OM, SEM and TEM. A new kind of precipitates distributed in line was clearly found in the specimens aged at high temperature (225~275 ℃) for a short time (15~30 min), which corresponded to a significant enhancement of hardness and tensile strength at room temperature. The TEM results showed that the precipitates distributed in line had a composition of Mg₁₂Nd and a granular shape, and mainly formed along the (0001)_Mg basal plane. The special distribution of the granular Mg₁₂Nd precipitates was effective barriers to the basal slips and may probably restrain the intergranular coordination during tensile deformation, leading to a large strengthening effect, that is, the yield strength and ultimate tensile strength, of the NZ31 alloy aged at 250~275 ℃ for 20~30 min, increased by about 70% and 29% respectively, in comparison with only the solutionized one.

Key words: magnesium alloy ageing treatment precipitate mechanical property

Received: 26 June 2015

Fund: Supported by National Natural Science Foundation of China (Nos.51301173 and 51531002) and National Basic Research Program of China (No.2013CB632202)

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	Wenhui WANG
	Di WU
	Rongshi CHEN
	Changsheng LOU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00333 OR https://www.ams.org.cn/EN/Y2016/V52/I5/567

Fig.1 Hardness evolution of the solutionized NZ31 magnesium alloy as a function of ageing time during isothermal ageing at 200 ℃ (a) and TEM image of NZ31 magnesium alloy after ageing at 200 ℃ for 12 h (Inset shows the SAED patter) (b)

Fig.2 Hardness evolution of the solutionized NZ31 magnesium alloy as a function of ageing temperature during equal time ageing for 30 min

Fig.3 OM (a~c, e, f) and SEM (d) images of NZ31 magnesium alloy in T4 condition (a) and ageing at 225 ℃ (b), 250 ℃ (c, d), 275 ℃ (e) and 300 ℃ (f) for 30 min (Thin straight lines in Figs.3b~e show precipitates distribution)

Fig.4 Hardness evolution of the solutionized NZ31 magnesium alloy as a function of ageing time during isothermal ageing at 275 ℃

Fig.5 OM images of the solutionized NZ31 magnesium alloy during isothermal ageing at 275 ℃ for 10 min (a), 20 min (b), 1 h (c) and 10 h (d)

Fig.6 Mechanical properties of the NZ31 magnesium alloy at room temperature in different conditions: solution treated (T4), ageing at 200 ℃ for 12 h (T6), ageing at 250 ℃for 30 min and ageing at 275 ℃ for 20 min after solution treatment

Fig.7 SEM image (a), TEM bright field image (b) and TEM dark field images (c, d) of precipitates after ageing at 275 ℃ for 20 min (Insets in Figs.7c and d show the SAED patterns of precipitates and Mg matrix taken with beam parallel to [011ˉ0]_Mg zone axes)

Fig.8 SAED patterns show the precipitates of the NZ31 magnesium alloy aged at 275 ℃ for 20 min taken with beam parallel to [0001]_Mg (a) and [112ˉ0]_Mg (b) zone axes

Table 1 EDS results of the precipitate in NZ31 magnesium alloy aged at 275 ℃ for 20 min

Fig.9 Strength functional mechanism of precipitates in NZ31 magnesium alloy aged at high temperature for a short time

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