Al4Cu9

metal

· Al4Cu9

Al4Cu9 is an intermetallic compound in the aluminum-copper system, representing a hard, brittle phase that forms at intermediate copper concentrations. This material is primarily of research and academic interest rather than a widespread commercial alloy, as intermetallics in this composition range are typically too brittle for conventional forming and machining. Its significance lies in understanding phase behavior in Al-Cu systems and in niche applications where high hardness and thermal stability at elevated temperatures are prioritized over ductility.

intermetallic researchwear-resistant coatingshigh-temperature structural compositesphase diagram studiesreinforcement particles in metal matrix composites

Compliance & Regulations

?EAR?Conflict Free?RoHS?REACH?TSCA?Prop 65

Units:

si imperial

Property	Value	Unit	Conditions
Bulk Modulus(K)2 entries	18,762.9	ksi	—
↳	18,762.9	ksi	—
Elastic Compliance Tensor(Sij)	Matrix (redacted)	1/GPa	—
Elastic Anisotropy(AU)	0.00345	-	—
Elastic Stiffness Tensor(Cij)	Matrix (redacted)	ksi	—
Poisson's Ratio(ν)	0.2715	-	—
Shear Modulus(G)2 entries	10,115	ksi	—
↳	10,115	ksi	—

N entriesMultiple entries per property — large groups are collapsed; click a summary row to expand. Use filters above to narrow by form, heat treatment, basis, or test environment.

Verified Unverified Low confidence (<80%) Link to source

Property	Value	Unit	Conditions	Source
Band Gap(Eg)	0.000	eV	—

Verified Unverified Low confidence (<80%) Link to source

Regulatory Screening

Environmental

Export Control

RoHS, REACH, and Prop 65 statuses are validated against official substance lists (ECHA SVHC Candidate List, OEHHA Prop 65, RoHS Annex II). Other regulations are estimated from composition and material classification. All screening is a starting point for due diligence — always verify with your supplier before making compliance decisions.

Al4Cu9

Mechanical Properties

Electrical Properties

Regulatory Screening

Environmental

Export Control