Enhanced precipitation hardening of Mg–Ca alloy by Al addition

Jayaraj, Jithu; Mendis, C.L.; Ohkubo, T.; Oh-ishi, Keiichiro; Hono, K.

doi:10.1016/j.scriptamat.2010.06.028

Cited by 128 publications

(42 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Based on the monolayer thickness of these precipitate plates, the enrichment of Ca in these particles and the selected-area electron diffraction patterns recorded matrix regions containing such precipitates. These precipitate plates are inferred [123] to be ordered G.P. zones such as those observed in the Mg-Ca-Zn and Mg-RE-Zn alloys.…”

Section: Mg-ca-based Alloysmentioning

confidence: 93%

“…The total concentration of ternary and quaternary alloying elements such as Ca and Sr in this AXJ530 alloy is high for the purpose of castability and creep resistance, whereas the potential of developing dilute precipitation-hardenable alloys based on the Mg-Al-Ca system was not explored. In a very recent study, [123] it was demonstrated that the ternary addition of an appropriate amount of Al (0.3 wt pct) to a Mg-0.5 wt pct Ca alloy can remarkably enhance the age-hardening response at 473 K (200°C) ( Figure 13(a)). The maximum age-hardening response achievable at the aging temperature is reduced if the Al content in the Mg-Ca-Al alloy is higher or lower than 0.3 wt pct.…”

Section: Mg-ca-based Alloysmentioning

confidence: 98%

“…[76,[120][121][122][123][124] A study made by Nie and Muddle [120] indicates that the Mg-1 wt pct Ca alloy exhibits only a moderate agehardening response during isothermal aging at 473 K (200°C). However, they noticed that the addition of 1 wt pct of Zn to the binary alloy led to a substantial increase in peak hardness and an accelerated rate of aging.…”

Section: Mg-ca-based Alloysmentioning

confidence: 99%

“…[43] The occurrence of the age-hardening phenomenon in the Mg-Ca-Al system offers the potential for developing a precipitation-hardenable wrought alloy. [123] In 2011, an unusual Mg-3.5Al-3.3Ca-0.4Mn (wt pct) extrusion alloy was developed. In the as-extruded condition, this alloy exhibits a tensile yield strength of 410 MPa, together with an elongation to fracture of 5.6 pct [128] ( Table II).…”

Section: Mg-ca-based Alloysmentioning

confidence: 99%

“…Among the RE-free magnesium alloys, the strength level achieved in this alloy is exceptionally impressive, and this is attributed to the formation of plate-shaped and spherical-shaped precipitates, basal texture, and refined grain size of magnesium. The identities of the two types of precipitates were not verified, but they were assumed [128] to be identical to those formed in Mg-0.5Ca-0.3Al (wt pct) [123] and Mg-6Al-3.2Ca-0.5Mn (wt pct) [129] alloys.…”

Section: Mg-ca-based Alloysmentioning

confidence: 99%

See 4 more Smart Citations

Precipitation and Hardening in Magnesium Alloys

Nie

2012

Metall Mater Trans A

1,342

519

View full text Add to dashboard Cite

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.

show abstract

Section: Mg-ca-based Alloysmentioning

confidence: 93%

Section: Mg-ca-based Alloysmentioning

confidence: 98%