Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (4): 938-946.doi: 10.13229/j.cnki.jdxbgxb.20220628

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Microstructure and wear resistance of （Mg2Si+Si）/Al composites

Xiao-bo LIU1(),Miao YANG2(),De-kun ZHOU1   

  1. 1.College of Mechanical Engineering，Beihua University，Jilin 132021，China
    2.Engineering Training Center，Beihua University，Jilin 132021，China
  • Received:2022-05-22 Online:2024-04-01 Published:2024-05-17
  • Contact: Miao YANG E-mail:stone-666@126.com;yangmiao1021@163.com

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Abstract:

In-situ （Mg2Si+Si）/Al composites were prepared by using melting casting with different solidification rates. The microstructure and wear resistance of （Mg2Si+Si）/Al composites were investigated. The results show that， after P modification， the primary Mg2Si transformed to polygonal blocks， while the primary Si was mainly complex morphology. With increasing the solidification rate， the number of primary Mg2Si and primary Si particles increased and their particle sizes decreased. Extraction tests showed that the Mg2Si crystals had tetrahedral and hexahedral morphologies. Dry sliding wear behaviors of （Mg2Si+Si）/Al composites with different solidification rates against 45# steel， under conditions of different sliding speeds and loads， were investigated. The results show that， the wear resistance of （Mg2Si+Si）/Al composites increased with the increasing of the solidification rate. The wear mechanisms of （Mg2Si+Si）/Al composites are mainly adhesive wear and abrasive wear.

Key words: in-situ （Mg2Si+Si）/Al composites, microstructure, dry sliding wear, wear resistance

CLC Number: 

  • TB331

Fig.1

XRD pattern of（Mg2Si+Si）/Al composite withsolidification rate of V1"

Fig.2

Microstructures of （Mg2Si+Si）/Al composites"

Fig.3

Mg2Si particles morphologies extracted from（Mg2Si+Si）/Al composites"

Fig.4

Evolvement process of hexahedral Mg2Si particle"

Fig.5

Curves of （Mg2Si+Si）/Al composites betweenwear volumes and applied load with a slidingvelocity of 700 r/min"

Fig.6

SEM and EDS results of wear surfaces of （Mg2Si+Si）/Al composites with load of 50 N"

Fig.7

SEM of wear debris on （Mg2Si+Si）/Al composites"

Fig.8

Curves of （Mg2Si+Si）/Al composites between wear volume and sliding velocity"

Fig. 9

SEM and EDS results of the wear surfaces of （Mg2Si+Si）/Al composites with a sliding velocity of 1 000 r/min"

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