The effect of micro-alloying addition of Cr on age hardening of an Mg–Zn alloy

Buha, Joka

doi:10.1016/j.msea.2008.04.014

Cited by 45 publications

(25 citation statements)

References 17 publications

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“…[73][74][75][76][77] However, the additions of appropriate alloying elements can equally result in a substantial enhancement in age-hardening response, as demonstrated in Figure 7(a). [75,77] The additions of 0.1 to 0.35 wt pct Ca to Mg-(4-6)Zn alloys, [78][79][80] the addition of Ag, or the combined addition of Ag and Ca to a Mg-6 wt pct Zn alloy [75,76,[81][82][83][84][85] can result in a significant enhancement in age-hardening response and tensile yield strength (Table II).…”

Section: Phase Equilibria and Precipitationmentioning

confidence: 99%

Precipitation and Hardening in Magnesium Alloys

Nie

2012

Metall Mater Trans A

1,396

519

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Magnesium alloys have received an increasing interest in the past 12 years for potential applications in the automotive, aircraft, aerospace, and electronic industries. Many of these alloys are strong because of solid-state precipitates that are produced by an age-hardening process. Although some strength improvements of existing magnesium alloys have been made and some novel alloys with improved strength have been developed, the strength level that has been achieved so far is still substantially lower than that obtained in counterpart aluminum alloys. Further improvements in the alloy strength require a better understanding of the structure, morphology, orientation of precipitates, effects of precipitate morphology, and orientation on the strengthening and microstructural factors that are important in controlling the nucleation and growth of these precipitates. In this review, precipitation in most precipitation-hardenable magnesium alloys is reviewed, and its relationship with strengthening is examined. It is demonstrated that the precipitation phenomena in these alloys, especially in the very early stage of the precipitation process, are still far from being well understood, and many fundamental issues remain unsolved even after some extensive and concerted efforts made in the past 12 years. The challenges associated with precipitation hardening and age hardening are identified and discussed, and guidelines are outlined for the rational design and development of higher strength, and ultimately ultrahigh strength, magnesium alloys via precipitation hardening.

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Section: Phase Equilibria and Precipitationmentioning

confidence: 99%

Precipitation and Hardening in Magnesium Alloys

Nie

2012

Metall Mater Trans A

1,396

519

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“…Hardness value reached nearly a plateau after about 2 months of ageing (1344 h) and a hardness increment of 47 VHN, and then remained on a similar level for the duration of the experiment. Although the hardening behaviour of Mg-Zn-Ti alloy during artificial ageing and ageing at intermediate temperatures seems generally comparable to that of other Mg-Zn based alloys [1,2,13,15], the microstructure or more precisely the relative fractions of the precipitates formed are visibly different from those observed in the binary [2] and Mg-Zn-Cu-Mn [1] alloys. This indicates that different alloying elements added to an Mg-Zn alloy promote or favour nucleation of different types of precipitates.…”

Section: Age Hardeningmentioning

confidence: 70%

“…from the [0 0 0 1] Mg direction, the two types of precipitates can be easily distinguished. In addition to [0 0 0 1] Mg rods and laths, thin plates on basal planes, some of which are GP zones [13][14][15], may also be present in the peak-aged T6 condition. The GP zones on basal planes are only a single magnesium atomic layer thick.…”

Section: Introductionmentioning

confidence: 99%

“…In the more recent studies, a number of novel and uncommon alloying elements have been introduced, some of which have never been used in magnesium alloys before and many of which had been presumed insoluble in the magnesium lattice. It has been shown that small amounts (trace or micro-alloying additions) of Ba [13], Cr [15], V [14] and Ti [21] have a number of disproportionately beneficial effects (relative to their content in the alloy) on the microstructure and mechanical properties of Mg-Zn alloy. Alloying with Ti [21] proves to be particularly beneficial.…”

Section: Introductionmentioning

confidence: 99%

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Characterisation of precipitates in an aged Mg–Zn–Ti alloy

Buha

2009

Journal of Alloys and Compounds

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“…Micro alloying additions of some elements may considerably influence the precipitation during ageing in many magnesium alloy systems. Geng and Buha [9,10] have reported that the addition of Co and Cr to a Mg-Zn alloy can increase number density of precipitates and enhances age-hardening response. Elsayed [11] investigated the influence of Na on age-hardening response of the Mg-9.8Sn-3.0Al-0.5Zn alloy.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Age Strengthening of Mg-Nd-Zn-Zr Alloy via Pre-Stretching

Guo

Zhao

Wang

et al. 2016

Metals

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Pre-stretching was carried out to modify the microstructure of Mg-Nd-Zn-Zr alloy to enhance its age strengthening. The results indicated that more heterogeneous nucleation sites can be provided by the high density of dislocations caused by the plastic pre-stretching deformation, as well as speeding up the growth rate of precipitates. Comparison of microstructure in non-pre-stretched specimens after artificial aging showed that pre-stretched specimens exhibited a higher number density of precipitates. The fine and coarse plate-shaped precipitates were found in the matrix. Due to an increase in the number density of precipitates, the dislocation slipping during the deformation process is effectively hindered, and the matrix is strengthened. The yield strength stabilizes at 4% pre-stretching condition, and then the evolution is stable within the error bars. The 8% pre-stretched specimens can achieve an ultimate tensile strength of 297 MPa. However, further pre-stretching strains after 8% cannot supply any increase in strength. Tensile fracture surfaces of specimens subjected to pre-stretching strain mainly exhibit a trans-granular cleavage fracture. This work indicated that a small amount of pre-stretching strain can further increase strength of alloy and also effectively enhance the formation of precipitates, which can expand the application fields of this alloy.

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The effect of micro-alloying addition of Cr on age hardening of an Mg–Zn alloy

Cited by 45 publications

References 17 publications

Precipitation and Hardening in Magnesium Alloys

Precipitation and Hardening in Magnesium Alloys

Characterisation of precipitates in an aged Mg–Zn–Ti alloy

Enhanced Age Strengthening of Mg-Nd-Zn-Zr Alloy via Pre-Stretching

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